Linux LPI 117-101 # 6 Of 9
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You wish to send the output of a command to standard output (stdout) and save it toa file. The command to use is ______________. (Do not specify arguments)
This quiz, titled 'Linux LPI 117-101 # 6 of 9', assesses knowledge on Linux command line operations. It covers commands for input\/output redirection, process control, and system information retrieval. Essential for learners aiming to master Linux administration and scripting skills.
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- 2.
The process big Certkiller is out of control, and efforts to cleanly stop it fail.You have executed a ps command and it displays the following info PID TTY TIME CMD 3541 pts/0 10:10:10 big Certkiller 3558 pts/0 00:00:00 ps What command should you type to absolutely stop the runaway process?
Explanation
While killing the process using -9 signal it unable to clean up before exiting. When you
use the -9 signal, it sends the sigkill signal. Other Avaialble signals are:
1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL
5) SIGTRAP 6) SIGABRT 7) SIGBUS 8) SIGFPE
9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR2
13) SIGPIPE 14) SIGALRM 15) SIGTERM 17) SIGCHLD
18) SIGCONT 19) SIGSTOP 20) SIGTSTP 21) SIGTTIN
22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ
26) SIGVTALRM 27) SIGPROF 28) SIGWINCH 29) SIGIO
30) SIGPWR 31) SIGSYS 34) SIGRTMIN 35) SIGRTMIN+1
36) SIGRTMIN+2 37) SIGRTMIN+3 38) SIGRTMIN+4 39) SIGRTMIN+5
40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+8 43) SIGRTMIN+9
44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13
52) SIGRTMAX-12 53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9
56) SIGRTMAX-8 57) SIGRTMAX-7 58) SIGRTMAX-6 59) SIGRTMAX-5
60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-2 63) SIGRTMAX-1
64) SIGRTMAXRate this question:
- 3.
What command or option will allow a program to continue operations after theinvoking user has logged out of the system? Type just the answer.
Explanation
nohup : run a command immune to hang-ups, with output to a
non-tty, to keep the process running after you logged out.Rate this question:
- 4.
What option can be used with the shutdown command to reboot the system?
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Shutdown -r
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Shutdown -y
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Shutdown -c
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Shutdown -b
Correct Answer
A. Shutdown -rExplanation
shutdown brings the system down in a secure way. All logged-in uers
are notified that the system is going to down, and login blocked.
shutdown -k message : Which sends the warning messages to all logged-in users.
shutdown -r time : Which reboots the system
shutdown -t time -h: Which halt the system after shutting down.Rate this question:
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- 5.
You are writing a script to automate some tasks. You would like to be able to have alog of everything that you see printed to your console, yet you want to be able to seethe output on the console as well.What textutils command would typically be used to accomplish this?
Correct Answer
teeExplanation
tee command redirect output to a file while still piping it to another
program.
Example: set | tee set.out | less : In example, output from set is written to file set.out
while also being piped to less.Rate this question:
- 6.
Which of the following syslog.conf entries would cause mail error messages to be sent to the system console?
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Mail error console
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Mail.err /dev/console
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Mail. error console
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Mail.err.console
Correct Answer
A. Mail.err /dev/consoleExplanation
Syntax of /etc/syslog.conf is :
facility.priority : Where facility represents facility of service and priority represents the
level of logs to store eg, info, err, emerg etc.Rate this question:
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- 7.
What will the command "kill -HUP 1354" do?
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Kill the process 1354 destructively
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Kill the process 1354, allowing cleanup of memory
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Restart the process 1354, re-reading it's config files
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Restart the process 1354, resetting it's associated modem
Correct Answer
A. Restart the process 1354, re-reading it's config filesExplanation
kill command is used to terminate the processes by default it sends the
TERM signal. When you send the -HUP signal, it will restart the process by reading
the original configuration file.Rate this question:
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- 8.
What is the disadvantage of using the command kill -9 ?
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A core dump file will be created.
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It affects the entire process group.
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It makes excessive use of system resources.
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The action can be blocked by buggy or malicious processes.
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The affected process is unable to clean up before exiting.
Correct Answer
A. The affected process is unable to clean up before exiting.Explanation
While killing the process, we can send the signal. By default kill
command sends the TERM signal, to send -9 signal
#kill -9 PID
While killing the process using -9 signal it unable to clean up before exiting.Rate this question:
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- 9.
You wish to start a process and run it in the background. The binary executable ismybinary, and it's in your path. Type in the command in its simplest form to dothis.
Correct Answer
mybinary &Explanation
Process can start either in foreground or in background. By default
commands executes on foreground. Running the process in foreground allows only
one command can enter at a time because we will get the shell to type another
command until fininshing the current command. But background process allows to
run the more than one command at a time.
To run the process in background just append the & at the end of the command.
Example:
# find / -name passwd >result &Rate this question:
- 10.
You wish to know what the previous runlevel the system was in. Type in thecommand to show this.
Correct Answer
runlevelExplanation
runlevel command displays the current and previous runlevel.
Example:
[root@server1 ~]# runlevel
N 3
[root@server1 ~]#
Which means Currenct runlevel is 3 is runlevel is not changed.
Standard Runlevel
0 - halt (Do NOT set initdefault to this)
1 - Single user mode
2 - Multiuser, without NFS (The same as 3, if you do not have networking)
3 - Full multiuser mode
4 - unused
5 - X11
6 - reboot (Do NOT set initdefault to this)Rate this question:
- 11.
What daemon controls the syslog?
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Syslog
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Syslogd
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Logd
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Sys
Correct Answer
A. SyslogdExplanation
Syslogd provides two system utilities which provide support for system
logging and kernel message trapping. Support of both internet and unix domain
sockets enables this utility packages to support both local and remote logging.Rate this question:
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- 12.
What command can be used to print out system boot messages?
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Bootm
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Bmsg
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Messages
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Dmesg
Correct Answer
A. DmesgExplanation
dmesg command prints the boot messages, you can check which
devices are detected by your kernel or not from the boot log messages.Rate this question:
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- 13.
Which of the following syslog.conf entries would cause kernel warning messages tobe sent to the system console?
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Kern.console warning
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Kern.warning /dev/console
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Kern.warning.console
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Kern warning console
Correct Answer
A. Kern.warning /dev/consoleExplanation
/etc/syslog.conf is the syslog configuration file, where we specified the
facility and priority to send the facility related log messages to specified file.
kernel.warning /dev/console : this line sends the warning related to kernel into
/dev/console.Rate this question:
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- 14.
What syslog.conf facility represents the line printer?
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Ptr
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Linep
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Lpr
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Lprinter
Correct Answer
A. LprExplanation
Facility in /etc/syslog.conf can be auth, authpriv, cron, daemon, kern,
lpr, mail, mark, news, security, syslog, user, uucp and local0. Where lpr is the
facility for line printer.Rate this question:
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- 15.
You wish to see the processes that are taking up CPU resources and their PIDnumbers. Type in the command that would do this including the options/argumentsto cause a refresh every second.
Correct Answer
top -d 1
top -d1Explanation
Explanation:
The top programs provides a dynamic real-time view of a running system. It can
display system summary information as well as a list of tasks currently being
mananged by the linux kernel.
-d interval : Delay Time : Specifies the delay between screen updates and overrides the
corresponding value in one personal configuration file or th startup default.Rate this question:
- 16.
What option can be used with the shutdown command to cancel a pendingshutdown?
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Shutdown -c
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Shutdown -x
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Shutdown -n
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Shutdown -u
Correct Answer
A. Shutdown -cExplanation
shutdown brings the system down in a secure way. All logged-in uers
are notified that the system is going to down, and login blocked.
Syntax: shutdown [time]
#shutdown -c : Which cancel the shutdown process.Rate this question:
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- 17.
Which of the following syslog.conf entries would cause kernel error messages to besent to the system console?
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Kern warning console
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Kern.error console
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Kern.warning /dev/console
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Kern error console
Correct Answer
A. Kern.warning /dev/consoleExplanation
/etc/syslog.conf is the syslog configuration file, where we specified the
facility and priority to send the facility related log messages to specified file.
kernel.warning /dev/console : this line sends the warning related to kernel into
/dev/console.Rate this question:
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- 18.
You want to do a system shutdown, but you don t want the shutdown to occurimmediately. You want the system to wait 60 seconds before doing the shutdown.What option can be used with the shutdown command to wait 60 seconds beforestarting theshutdown?
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Shutdown -t 60
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Shutdown -w 1
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Shutdown -c 60
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Shutdown -t 1
Correct Answer
A. Shutdown -t 60Explanation
shutdown brings the system down in a secure way. All logged-in uers
are notified that the system is going to down, and login blocked.
Syntax: shutdown [time]
#shutdown -c : Which cancel the shutdown process.Rate this question:
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- 19.
Which of the following GNU commands would be the most likely command you'duse to find the system load average?
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Top
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Nice
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Loadavg
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Cpustat
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Ps
Correct Answer
A. TopExplanation
The top program provides a dynamic real-time view of a running
system. It can display system summary information as well as a list of tasks
currently being managed by the Linux kernel. The types of system summary
information shown and the types, order and size of information displayed for tasks
are all user configurable and that configuration can be made persistent across
restarts.Rate this question:
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- 20.
What command changes the priority of the process running with process id of 12345to the highest priority?
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/usr/bin/renice +20 1234
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/usr/bin/renice -20 12345
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/bin/setpriority +20 12345
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/bin/setpriority -20 12345
Correct Answer
A. /usr/bin/renice -20 12345Explanation
To change the priority of running process we use the renice command.
Default priority is 0, highest priority is -20 and lowest priority is 19. The path of
renice command is /usr/bin/renice.Rate this question:
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- 21.
To keep a process running after you logged out, you start it with the command:
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Nohup
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Fg
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Live
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Sh
Correct Answer
A. NohupExplanation
nohup : run a command immune to hang-ups, with output to a
non-tty, to keep the process running after you logged out.Rate this question:
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- 22.
You have backgrounded a job called big Certkiller . When you type jobs and the command line it comes back with the following info. jobs [1] Running job1 [2] - Running big Certkiller [3]+ Stopped job5 Type the command any switch(es) that would bring big Certkiller to the foreground.
Correct Answer
fg %2Explanation
when you enter the command it runs on foreground, which means you
can type the commands after completing only, this is called foregroup but when you
run the command in background, it allows to run multiple commands on same shell.
bg jobid: which runs the jobs in background
fg jobid: Which runs the jobs in foreground.Rate this question:
- 23.
You have just added the following line to your syslog.conf file: lpr.info /dev/console. But, line printer messages are not being sent to the console. What is most likely the problem?
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After modifying the syslog.conf file, the syslog daemon needs to be restarted.
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The entry is formatted incorrectly
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The syslog daemon reads it configuration information from the syslogd file
Correct Answer
A. After modifying the syslog.conf file, the syslog daemon needs to be restarted.Explanation
syslog is the daemon, which reads /etc/syslog.conf configuration file.
After changing the configuration of syslog.conf you should restart the syslog service.
# service syslog restartRate this question:
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- 24.
In the command 'test < bill | Certkiller '.
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The stdout from the command Certkiller is saved to the file test.
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The stdout from the command test is saved to the file Certkiller .
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The command Certkiller receives its stdin from the stderr of test.
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The command Certkiller receives its stdin from the stdout of test.
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The command bill receives its stdin from the contents of the file Certkiller .
Correct Answer
A. The command Certkiller receives its stdin from the stdout of test.Explanation
Common Redirection Operators
Command >file : Redirects standard output of command into the file
Command>>file : Append the standard output of command into the file
Commandfile : Redirects the standard Error into the file
And Pipe (|) is used to combine the command, in piping outout of first command goes as
input to the second command.
Answer D is correct because test command takes input from the Bill file and sends the
standard output to Certkiller command.Rate this question:
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- 25.
What syslog.conf facility represents user processes?
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Auth
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Proc
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User
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U
Correct Answer
A. UserExplanation
user facility represents the user processes Example:
User.* /var/log/userlogs : It sends all user processes logs into /var/log/userlogs fileRate this question:
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- 26.
In order to append the output of ls to a file called result, which of the following commandlines would you use?
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Ls > result
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Ls >& result
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Ls &> result
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Ls >> result
Correct Answer
A. Ls >> resultExplanation
> will save the output to result
>> will append the output to result
>& will copy the output to resultRate this question:
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- 27.
What syslog.conf facility represents Unix to Unix copy?
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Ucp
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Copy
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Uucp
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Uuc
Correct Answer
A. UucpExplanation
Facility in /etc/syslog.conf can be auth, authpriv, cron, daemon, kern,
lpr, mail, mark, news, security, syslog, user, uucp and local0. Where uucp facility
represents Unix to Unix copy.Rate this question:
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- 28.
What does the command "foo < bar | foobar" do?
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Foo reads bar as stdin, pipes output to foobar
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Foo and bar are fed to foobar as stdin
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Foo's output is sent to bar, output is written to foobar
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None of the above
Correct Answer
A. Foo reads bar as stdin, pipes output to foobarExplanation
Common Redirection Operators
Command >file : Redirects standard output of command into the file
Command>>file : Append the standard output of command into the file
Commandfile : Redirects the standard Error into the file
And Pipe (|) is used to combine the command, in piping outout of first command goes as
input to the second command.
Answer A is correct because foo command takes input from the bar file and sends the
standard output to foobar command.Rate this question:
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- 29.
What is the name of the configuration file used by the syslog daemon?
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Syslog.conf
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Syslogd
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Slog.conf
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System.conf
Correct Answer
A. Syslog.confExplanation
/etc/syslog.conf is the main log configuration file reads by syslogd
service. Which logs system messages on unix system.Rate this question:
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- 30.
What syslog.conf facility represents mail processes?
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Proc
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Daemon
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Mail
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Smtp
Correct Answer
A. MailExplanation
Facility in /etc/syslog.conf can be auth, authpriv, cron, daemon, kern,
lpr, mail, mark, news, security, syslog, user, uucp and local0. Where mail facility
represents the mail processes . By default mail logs are send to /var/log/maillog file.Rate this question:
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- 31.
When executing a command that produces output to the screen, you get an exit codeof 0. Choose the best description of what has happened
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The program executed properly
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The program encountered an error
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The program requires more input
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The program has returned standard input
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The program terminated with a syntax error
Correct Answer
A. The program executed properlyExplanation
when you executes the program, it returns the exit code either 0 or
1-255. If returns the exit code 0 it means program executed successfully it it returns
non-zero values it means error occurred during executing the program.Rate this question:
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- 32.
Which of the following commands sends an unclean and immediate kill signal to processID (PID) 1555?
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Kill 1555
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Kill -1 1555
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Kill -2 1555
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Kill -9 1555
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Kill -15 1555
Correct Answer
A. Kill -9 1555Explanation
-9 is the powerfull signal, which sends an unclean and immediate kill
signal to process ID.Rate this question:
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- 33.
What syslog.conf facility represents user processes?
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Auth
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Proc
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User
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U
Correct Answer
A. UserExplanation
user facility represents the user processes Example:
User.* /var/log/userlogs : It sends all user processes logs into /var/log/userlogs fileRate this question:
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- 34.
Regardless of the version of Linux, which of the following help start and stopservices on demand? Select two.
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Xinetd
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Inetd
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Samba
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Nfs
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Amd
Correct Answer(s)
A. Xinetd
A. InetdExplanation
xinetd performs the same function as inetd: it starts programs that
provide Internet services. Instead of having such servers started at system
initialization time, and be format until a connection request arrives, xinetd is the
only daemon process started and it listens on all service ports ofr the services listed
in it's configuration file.Rate this question:
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- 35.
What syslog.conf facility represents user authentication processes?
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Auth
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Proc
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User
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Login
Correct Answer
A. AuthExplanation
auth facility represents the user authentication processes, and
authentication related logs will send to /var/log/secure.Rate this question:
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- 36.
Given the following output: prompt> myapp[1]+ Stopped myappprompt>Which of the following commands resume executing the stopped process while allowing the user to continue to type commands at thecommand line.
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Bg myapp
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Continue myapp
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Exec myapp
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Fg myapp
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Myapp &
Correct Answer
A. Bg myappExplanation
Jobs running on foregroud can suspend by pressing ctrl+z. Then
suspended job can be run either in foreground or in background. To run in
foregroud, fg command and to run in background bg command.
Or
bg job id
fg job idRate this question:
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- 37.
What syslog.conf facility represents kernel processes?
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User
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Proc
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Daemon
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Kern
Correct Answer
A. KernExplanation
kern facility represents the kernel processes, in first line of
/etc/syslog.conf file, you can see kern.* /dev/console, this means all kernel related log
messages will send to /dev/console.Rate this question:
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- 38.
What is the result of the following command?command > file1.out 2>&1
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Redirects stderr to file1.out
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Redirects the stderr to the same location as the stdout.
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Redirects stdout to the screen and stderr to file.out
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Redirects all the output to the same location as the stderr
Correct Answer
A. Redirects the stderr to the same location as the stdout.Explanation
Common Redirection Operators
Command >file : Redirects standard output of command into the file
Command>>file : Append the standard output of command into the file
Commandfile : Redirects the standard Error into the file
And Pipe (|) is used to combine the command, in piping outout of first command goes as
input to the second command.
When we executes the command it generates the standard output as well as standard error
and displays in standard output (Terminal Window) is default. When we redirect the
standard error as well as standard output into the file, it will not send any output into the
terminal window.Rate this question:
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- 39.
You set a variable's value with the command "export TEST=snuffy" and then after executing the following script file, you type the command "echo $TEST". scriptfile1 #!/bin/bash USER=certkiller TEST=$USER What is the variable's value that is returned?
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Snuffy
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Certkiller
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Empty
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Variable undeclared
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TEST
Correct Answer
A. SnuffyExplanation
Export sets the shell variable named TEST to snuffy.Rate this question:
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- 40.
What syslog.conf facility represents Usenet news?
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Usenet
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News
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Uunet
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Net
Correct Answer
A. NewsExplanation
news represents Usenet news example:
Uucp,news.crit /var/log/spooler This line represents the logs of news to redirect into the
/var/log/spooler log files.Rate this question:
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- 41.
When the kill command is given with only the PID number of the process to kill (asin 'kill 1234'), this corresponds to which type of kill signal?
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2 (SIGINT)
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1 (SIGHUP)
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9 (SIGKILL)
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3 (SIGQUIT)
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15 (SIGTERM)
Correct Answer
A. 15 (SIGTERM)Explanation
When you send the kill command it by default sends the TERM signal.Rate this question:
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- 42.
Which of the following commands is equivalent to kill 1234?
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Kill -1 1234 or kill -s SIGHUP 1234
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Kill -2 1234 or kill -s SIGINT 1234
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Kill -3 1234 or kill -s SIGQUIT 1234
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Kill -9 1234 or kill -s SIGKILL 1234
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Kill -15 1234 or kill -s SIGTERM 1234
Correct Answer
A. Kill -15 1234 or kill -s SIGTERM 1234Explanation
The command kill sends the specified signal to the specified process or
process group. If no signal is specified, the TERM signal is sent.Rate this question:
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- 43.
You need to have all the output from the executable myprog written to a text lognamed file1.out. This program must not send any output to the console. Which ofthe commands listed will accomplish this?
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Myprog > file1.out 2>&1
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Myprog > file1.out 1>&2
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Myprog > file1.out 1> /dev/null
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Myprog 1&2> file1.out
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Myprog 1> /dev/null > file1.out
Correct Answer
A. Myprog > file1.out 2>&1Explanation
Common Redirection Operators
Command >file : Redirects standard output of command into the file
Command>>file : Append the standard output of command into the file
Commandfile : Redirects the standard Error into the file
And Pipe (|) is used to combine the command, in piping outout of first command goes as
input to the second command.
When we executes the command it generates the standard output as well as standard error
and displays in standard output (Terminal Window) is default. When we redirect the
standard error as well as standard output into the file, it will not send any output into the
terminal window.
myprog >file1.out 2>&1 : Where & works as a Logical AND Operator.Rate this question:
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- 44.
What key sequence will suspend the current process and return you to a shell prompt?
-
Ctrl-z
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Ctrl-c
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Ctrl-x
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Ctrl-d
Correct Answer
A. Ctrl-zExplanation
A is correct because to suspend the foreground job we use ctrl+z
keystroke. And it converts the foreground jobs in background in stopped status.
To display background job use: jobs commandRate this question:
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- 45.
What will the command "kill -HUP 1354" do?
-
Kill the process 1354 destructively
-
Kill the process 1354, allowing cleanup of memory
-
Restart the process 1354, re-reading it's config files
-
Restart the process 1354, resetting it's associated modem
Correct Answer
A. Restart the process 1354, re-reading it's config filesExplanation
kill command is used to terminate the processes by default it sends the
TERM signal. When you send the -HUP signal, it will restart the process by reading
the original configuration file.Rate this question:
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- 46.
What syslog.conf facility represents the cron daemon?
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Crond
-
Daemon
-
Cron
-
Crontab
Correct Answer
A. CronExplanation
You can see in /etc/syslog :
Cron.* /var/log/cron
This line represents that cron related all log messages will write into /var/log/cron file.Rate this question:
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- 47.
What syslog.conf facility represents login processes?
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Proc
-
Login
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User
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Auth
Correct Answer
A. AuthExplanation
auth is the facility which represents the login processes. Either local
login or remote login, auth facilitiy traps the logs and writes into /var/log/secure file.Rate this question:
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- 48.
Exhibit, output: prompt> Certkiller app [1]+ Stopped Certkiller app prompt> Which of the following commands will resume executing the stopped process while allowing the user to continue to type commands at the command prompt?
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Bg Certkiller app
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Continue Certkiller app
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Exec Certkiller app
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Fg Certkiller app
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Certkiller app &
Correct Answer
A. Bg Certkiller appExplanation
Process can start either in foreground or in background. By default
commands executes on foreground. Running the process in foreground allows only
one command can enter at a time because we will get the shell to type another
command until fininshing the current command. But background process allows to
run the more than one command at a time.
To run the process in background just append the & at the end of the command.
Example:
# find / -name passwd >result &
We can suspend the jobs running in foreground by pressing ctrl+z shortcut. As well as
can resume the suspended jobs either in background or foreground.
#fg %jobid : Runs the job in foreground
#bg %jobid : Runs the job in background
or
#fg command
#bg commandRate this question:
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- 49.
What syslog.conf facility represents miscellaneous daemons?
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Misc
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Proc
-
Kern
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Daemon
Correct Answer
A. DaemonExplanation
daemon facility represents the miscellaneous daemons like httpd,
vsftpd etcRate this question:
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Current Version
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Apr 17, 2024Quiz Edited by
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Feb 07, 2009Quiz Created by
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Mar 21, 2023
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DS Process QnA [Dev]![DS Process QnA [Dev]](https://media.proprofs.com/images/QM/user_images/1826446/New%20Project%20%2844%29%2860%29.webp)
The DS Process QnA [Dev] quiz assesses knowledge of specific command line tools used in software development environments. It covers commands for file operations, workspace...
Questions:
20 |
Attempts:
118 |
Last updated:
Apr 09, 2024
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Windows Command Prompt
The windows command prompt is essential to the functioning of a computer. It might not be as simple or complex as you think so just try it out and see for yourself. All the...
Questions:
25 |
Attempts:
4804 |
Last updated:
Jan 06, 2025
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HBWSL - Linux Basic Commands
The 'HBWSL - Linux Basic Commands' quiz assesses knowledge of essential Linux command line tools. It covers commands for memory utilization, clearing terminal display, file...
Questions:
65 |
Attempts:
639 |
Last updated:
Mar 21, 2023
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