Linux LPI 117-101 # 3 Of 9
Linux lpi testing
Questions and Answers
- 1.
What operation of the make utility cannot normally be performed as a normal user?
- A.
Mrproper
- B.
Clean
- C.
Dep
- D.
Depends
- E.
Install
Correct Answer
E. InstallExplanation
make install or install command creates/writes the files or directory on
different directory. To write or to create user required write permission to parent
directory. Generally, normal users doesn't have write permission to system
directory.Rate this question:
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- 2.
Type the simplest command with switches to unpack a compressed archive namedfile1.tar.gz?
Correct Answer
tar -zxf file1.tar.gz
tar zxf file1.tar.gz
tar xzf file1.tar.gz
tar -xzf file1.tar.gzExplanation
Generally files will archive using tar command. To archive tar cvf tarfilename.tar source files To extract from the tar archive file: tar xvf tarfilename.tar
In QUESTION showing the file archived as well as compressed using gzip command.
We can archive as well as compress at one time using:
tar -czfv tarfilename.cgz or first create the archive file and then compress using gzip or gzip2 command.
To extract :
tar -zxf filename
or
uncompress the file : gunzip compressedfile
extract from the tar. tar xvf tarfile.Rate this question:
- 3.
You want to add files to a previously created tar file. You want to replace existingfiles with newer files, how can you do this?
- A.
Use the append command
- B.
Use the tar command with the -t switch
- C.
Use the add command
- D.
Use the tar command with the -u switch
Correct Answer
D. Use the tar command with the -u switchExplanation
To append the newer or updated files only on existing tar file either use the -u or --update option on tar command
Example: tar -u tarfilename.tar sourcefileRate this question:
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- 4.
You want to add information to a previously created tar file. How would you do this?
- A.
Use the tar command with the -a switch
- B.
Use the append command
- C.
Use the add command
- D.
Use the tar command with the -r switch
Correct Answer
D. Use the tar command with the -r switchExplanation
To append the new file at the end of existing tar file use either -r or
--append option.
Example:
tar -r tarfilename.tar newfilenameRate this question:
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- 5.
You want to find out what files are contained in a tar file. How would you do this?
- A.
Use the tar command with the -t switch
- B.
Use the tar command with the -r switch
- C.
Use the grep command
- D.
Use the find command
Correct Answer
A. Use the tar command with the -t switchExplanation
To test the tar files by displaying the contents of tar file use the -t or
--list option on tar command.
Example: tar -t tarfilename.tarRate this question:
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- 6.
Which of the following commands can be used to extract a tar file?
- A.
Tar -vf
- B.
Tar -xvf
- C.
Tar -e
- D.
Tar -v
Correct Answer
B. Tar -xvfExplanation
tar -xvf tarfile
Some Common Options:
c Create a tar file
t Test a tar file
x Extract a tar file
v Verbose
f Tar FilenameRate this question:
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- 7.
Which of the following commands can be used to create a tar archive file in verbosemode?
- A.
Tar -v
- B.
Tar -cvf
- C.
Tar -c
- D.
Tar -vf
Correct Answer
B. Tar -cvfExplanation
To create a tar file with verbose mode
tar -cvf tarfilename sourcefiles
Some Common Options:
c Create a tar file
t Test a tar file
x Extract a tar file
v Verbose
f Tar FilenameRate this question:
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- 8.
Type in the command line to upgrade a package using the apt-get command. Thepackage name is package1.
Correct Answer
apt-get upgrade package1Explanation
Updating Information on Available Packages
To update information on available packages, issue the following command:
apt-get updateInstalling a PackageTo install a specified package, issue the following
command:apt-get install packagewhere package specifies the name of the package to be
installed.Upgrading Installed PackagesTo automatically upgrade all installed packages to
the latest available version, issue the following command:apt-get upgrade packageRate this question:
- 9.
Type in the command to update the apt-get database with new or updated packages.
Correct Answer
apt-get updateExplanation
Updating Information on Available Packages
To update information on available packages, issue the following command:
apt-get updateInstalling a PackageTo install a specified package, issue the following
command:apt-get install packagewhere package specifies the name of the package to be
installed.Upgrading Installed PackagesTo automatically upgrade all installed packages to
the latest available version, issue the following command:apt-get upgrade packageRate this question:
- 10.
What is the location including the full path to where apt-get stores its downloadedpackages?
Correct Answer
/var/cache/apt/archivesExplanation
atp-get command stores the downloaded packages on
/var/cache/atp/archivesRate this question:
- 11.
While installing an application from source code you don't see theconfigure script. What command can you run to compile the code?
- A.
Make configure
- B.
Install
- C.
Install makefile
- D.
Make
Correct Answer
D. MakeExplanation
The purpose of the make utility is to determine automatically which pieces of a large program need to be recompiled, and issue the commands toRate this question:
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- 12.
User Joseph has successfully extracted and compiled a program fromsource code. Installing the binaries produces errors. What is the mostlikely reason?
- A.
The source code was complied for a different CPU.
- B.
The permissions set in the /usr/bin directory are wrong.
- C.
The binaries require root privileges to be installed.
- D.
The wrong prefix was used during configuration of the source code.
Correct Answer
C. The binaries require root privileges to be installed.Explanation
The most likely reason for the errors occurring during the installation of the binaries is that they require root privileges to be installed. Root privileges are necessary for certain system-level operations, such as modifying system directories or accessing restricted resources. Without the proper permissions, the installation process may encounter errors and fail to complete successfully.Rate this question:
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- 13.
You are compiling some software from source. After running ./configure with the appropriate arguments and no errors, what is the next command to run?
Correct Answer
./makeExplanation
The purpose of the make utility is to determine automatically which
pieces of a large program need to be recompiled, and issue the commands to recompile
them. example C programs, since they are most common, but you can use make with any
programming language whose compiler can be run with a shell command. In fact, make
is not limited to programs. You can use it to describe any task where some files must be
updated automatically from others whenever the others change.
To prepare to use make, you must write a file called the makefile that describes the
relationships among files in your program, and the states the commands for updating
each file. In a program, typically the executable file is updated from object files, which
are in turn
made by compiling source files.Rate this question:
- 14.
While installing from source code you don't see the configuration script. Whatcommand can you run to compile the code?
- A.
Make configure
- B.
Install
- C.
Install makefile
- D.
Make
Correct Answer
D. MakeExplanation
The purpose of the make utility is to determine automatically which
pieces of a large program need to be recompiled, and issue the commands to recompile
them. example C programs, since they are most common, but you can use make with any
programming language whose compiler can be run with a shell command. In fact, make
is not limited to programs. You can use it to describe any task where some files must be
updated automatically from others whenever the others change.
To prepare to use make, you must write a file called the makefile that describes the
relationships among files in your program, and the states the commands for updating
each file. In a program,typically the executable file is updated from object files, which
are in turn
made by compiling source files.
So, make command compile the source code.Rate this question:
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- 15.
Which system administration command you can use to update ld.so.cache after theinstallation of new shared libraries?
- A.
Ldconfig
- B.
Ldd
- C.
Libpath
- D.
Newlibs
Correct Answer
A. LdconfigExplanation
ldconfig creates the necessary links and cache to the most recent
shared libraries found in the directories specified on the command line, in the file
/etc/ld.so.conf, and in the trusted directories (/lib and /usr/lib). The cache is used by
the run-time linker, ld.so or ld-linux.so. ldconfig checks the header and file names of
the libraries it encounters when determining which versions should have their links
updated.Rate this question:
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- 16.
Which utility can you call to find out what shared libraries a program is using?
- A.
Ldd
- B.
Ld.so
- C.
Modprobe
- D.
Ldconfig
- E.
Ld-linux.so
Correct Answer
A. LddExplanation
ldd command prints the shared libraries required by each program or
shared library specified on the command line.
Example: ldd libdb.so.3
libc.so.6 => /lib/tls/libc.so.6 (0x00237000)
/lib/ld-linux.so.2 (0x0021e000)Rate this question:
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- 17.
What is the full path including the filename of the configuration file that stores thelocations of all library files on the system?
Correct Answer
/etc/ld.so.confExplanation
ldconfig creates the necessary links and cache to the most recent
shared libraries found in the directories specified on the command line, in the file
/etc/ld.so.conf, and in the trusted directories (/lib and /usr/lib). The cache is used by
the run-time linker, ld.so or ld-linux.so. ldconfig checks the header and file names of
the libraries it encounters when determining which versions should have their links
updated.
Some files:
/lib/ld.so run-time linker/loader
/etc/ld.so.conf File containing a list of colon, space, tab, newline, or comma spearated
directories in which to search for libraries.
/etc/ld.so.cache File containing an ordered list of libraries found in the directories
specified in /etc/ld.so.conf.Rate this question:
- 18.
On boot, your system shows messages that mention library file errors. Whatcommand should you type (command only) to attempt to fix the library errors?
Correct Answer
ldconfigExplanation
ldconfig command is used to configure dynamic linker run time
bindingsRate this question:
- 19.
What command will display the needed libraries for the program myprog1 to run?
Correct Answer
ldd myprog1Explanation
ldd command prints the shared libraries required by each program or
shared library specified on the command line.Rate this question:
- 20.
What file is read by the program ldconfig?
- A.
/lib/ld.so
- B.
/etc/ld.so.conf
- C.
/etc/ld.so.cache
- D.
/etc/modules.conf
Correct Answer
B. /etc/ld.so.confExplanation
ldconfig creates the necessary links and cache to the most recent shared libraries
found in the directories specified on the command line, in the file /etc/ld.so.conf, and
in the trusted directories (/lib and /usr/lib). The cache is used by the run-time linker,
ld.so or ld-linux.so. ldconfig checks the header and file names of the libraries it
encounters when determining which versions should have their links updated.
Some files:
/lib/ld.so run-time linker/loader
/etc/ld.so.conf File containing a list of colon, space, tab, newline, or comma spearated
directories in which to search for libraries.
/etc/ld.so.cache File containing an ordered list of libraries found in the directories
specified in /etc/ld.so.conf.Rate this question:
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- 21.
What environment variable will set the path for added libraries?
- A.
LD_LIBRARY_PATH
- B.
LIBPATH
- C.
LPATH
- D.
LIB
- E.
None of the above
Correct Answer
A. LD_LIBRARY_PATHExplanation
the LD_LIBRARY_PATH environmental variable set the path for
added libraries. You can display environmental varialble using env command.Rate this question:
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- 22.
You are preparing a new set of shared libraries in /usr/local/applib and you havewritten and compiled some code that uses these libraries. You have alreadyperformed and ldconfig, however the system still cannot find the shared libraries.What is most likely the cause of this?
- A.
You used the wrong compiler.
- B.
Your did not update your PATH variable.
- C.
You compiled the code with wrong library.
- D.
You forgot to put the library path in ld.so.conf
Correct Answer
D. You forgot to put the library path in ld.so.confExplanation
/etc/ld.so.conf File containing a list of colon, space, tab, newline, or comma
spearated directories in which to search for libraries. So you should specify the path the
libraries in /etc/ld.so.conf file.Rate this question:
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- 23.
What is filename including full path, of the file used to configure library pathsettings for a system?
- A.
/usr/lib/lib.so.1
- B.
/etc/lib.conf
- C.
/etc/ld.so.conf
- D.
/usr/lib/modules/modules.conf
- E.
None of the above
Correct Answer
C. /etc/ld.so.confExplanation
/etc/ld.so.conf File containing a list of colon, space, tab, newline, or comma
spearated directories in which to search for libraries. So you should specify the full path
the libraries in /etc/ld.so.conf file.Rate this question:
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- 24.
What happens when ldconfig is executed?
- A.
The binary index file (cache) of library locations is rebuilt
- B.
The text index file of library locations is rebuilt
- C.
Make is run to rebuild the libraries who's source code has changed
- D.
The disk is scanned for libraries to include in the index
- E.
Nothing, unless the libraries have been recompiled since ldconfig was last run.
Correct Answer
A. The binary index file (cache) of library locations is rebuiltExplanation
ldconfig creates the necessary links and cache to the most recent
shared libraries found in the directories specified on the command line, in the file
/etc/ld.so.conf, and in the trusted directories (/lib and /usr/lib). The cache is used by
the run-time linker, ld.so or ld-linux.so. ldconfig checks the header and file names of
the libraries it encounters when determining which versions should have their links
updated.Rate this question:
-
- 25.
To what environment variable will you assign or append a value ifyou need to tell the dynamic linker to look in a build directory for someof a program's shared libraries?
- A.
LD_LOAD_PATH
- B.
LD_LIB_PATH
- C.
LD_LIBRARY_PATH
- D.
LD_SHARE_PATH
- E.
LD_RUN_PATH
Correct Answer
C. LD_LIBRARY_PATHExplanation
the LD_LIBRARY_PATH environmental variable set the path for
added libraries. You can display environmental varialble using env command.Rate this question:
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- 26.
What tool can you use to print shared library dependencies?
- A.
Ldconfig
- B.
Ldd
- C.
Libdep
- D.
Libpath
- E.
Ldev
Correct Answer
B. LddExplanation
Explanation: ldd command prints the shared libraries required by each program or
shared library specified on the command line.
Example: ldd libdb.so.3
libc.so.6 => /lib/tls/libc.so.6 (0x00237000)
/lib/ld-linux.so.2 (0x0021e000)Rate this question:
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- 27.
You wish to install a debian package using dpkg called debianpackage.deb. Give thesimplest command line to do this.
Correct Answer
dpkg -i debianpackage.deb
dpkg --install debianpackage.debExplanation
There are two different options -i or -install. Convention is short option starts from - and
long option starts from -- .
If you have a package file containing a package you want to install, the simplest way to
install the package is to use the dpkg command:
dpkg --install packagefile
where packagefile stands for the name of the package file, which generally ends with the
characters .deb. If all the prerequisite packages have already been installed and if the
package does not conflict with any installed packages, the command will unpack the
package files, move them to their proper locations, and execute the scripts necessary to
configure the package.Rate this question:
- 28.
You have a package called debianpkg.deb and wish to convert it to an rpm.Type the command line that will do this for you including switches.
Correct Answer
alien -r debianpkg.deb
alien --to-rpm debianpkg.debExplanation
Debian Linux generally uses .deb format packages and Redhat uses .rpm format packages. There is a command named alien used to convert .deb toRate this question:
- 29.
Type the command line including switches to convert and install a Redhat packagenamed package.rpm on a Debian system?
Correct Answer
alien -i package.rpm
alien --install package.rpmExplanation
Redhat packages are in .rpm format and debian packages are in .deb
format. To convert or to install the .rpm packages on debian linux:
alien -i or --install package.rpmRate this question:
- 30.
What is the correct syntax to remove Certkiller entirely from a Debian Systemincluding configuration files?
- A.
Dpkg -r Certkiller
- B.
Dpkg --remove Certkiller
- C.
Dpkg --kill Certkiller
- D.
Dpkg -R Certkiller
- E.
Dpkg --purge Certkiller
Correct Answer
E. Dpkg --purge CertkillerExplanation
To remove an installed package, use the command
dpkg --remove package à this command does not remove package configuration files,
which may facilitate subsequent re-installation of the package. If you want to remove the
configuration files as well, use the command:
dpkg --purge packageRate this question:
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- 31.
What are the default permissions on the Debian /etc/passwd file?
- A.
644
- B.
640
- C.
777
- D.
700
- E.
400
Correct Answer
A. 644Explanation
The default permission of /etc/passwd file is:
-rw-r--r--
In Here read and write to owner user, read only to group member and others.
Numerical value of Read 4
Numerical value of Write 2
Numerical value of Execute 1
So default permission is 644Rate this question:
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- 32.
What are the default permissions on the Debian /etc/shadow file?
- A.
654
- B.
640
- C.
400
- D.
644
- E.
540
Correct Answer
C. 400Explanation
The default permission of /etc/shadow file is:
-r--------
In Here read only to owner user and no permission to others.
Numerical value of Read 4
Numerical value of Write 2
Numerical value of Execute 1
So default permission is 400Rate this question:
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- 33.
How do you use dpkg to verify the status of an installed package Certkiller pkg? Selecttwo.
- A.
Dpkg -s Certkiller pkg
- B.
Dpkg -S Certkiller pkg
- C.
Dpkg -stat Certkiller pkg
- D.
Dpkg --stat Certkiller pkg
- E.
Dpkg --status Certkiller pkg
Correct Answer(s)
A. Dpkg -s Certkiller pkg
E. Dpkg --status Certkiller pkgExplanation
To verify the install packages on debian linux either -s or --status
options is used.Rate this question:
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- 34.
Which pair of dpkg options are equivalent and what do they do?
- A.
-C and --configure they reconfigure an unpackaged package
- B.
-C and --clear-avail they erase exisiting information about what packages are available
- C.
-A and --audit they update information about what packages are available
- D.
-C and --audit they provide resource consumption information on installed packages
- E.
-C and --audit they search for partially installed packages
Correct Answer
E. -C and --audit they search for partially installed packagesExplanation
To check the partially installed packages: package -C or --audit packagenameRate this question:
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- 35.
You wish to install a package named package.deb using the apt-get tool. Type thesimplest command line to do this.
Correct Answer
apt-get install package.debExplanation
To install the package using apt-get commandRate this question:
- 36.
What is the name and full path to the location of the dpkg database?
Correct Answer
/var/lib/dpkgExplanation
Local database is maintain in debian as well as in redhat. /var/lib/dpkg
is the local package database for debian linux and /var/lib/rpm for redhat.Rate this question:
- 37.
Which TWO of the following commands allows you to manage .deb packages?
- A.
Dpkg
- B.
Deb
- C.
Dselect
- D.
Debselect
Correct Answer(s)
A. Dpkg
C. DselectExplanation
dselect - console Debian package handling frontend
dpkg - package manager for DebianRate this question:
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- 38.
How can you list files owned by a specific .deb package?
- A.
Dpkg -L package
- B.
Dpkg --dump package
- C.
Dselect --dump package
- D.
Dselect -L package
Correct Answer
A. Dpkg -L packageExplanation
To list the files installed from a specified package, issue the command:
dpkg --listfiles package or dpkg -L packageRate this question:
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- 39.
You have not run apt-get, on a system for some time, but it has beenrun on the system before. What apt-get command would you run todownload the latest list of packages, but not the packages themselves?
- A.
Apt-get build-dep
- B.
Apt-get mirror-select
- C.
Apt-get update
- D.
Apt-get upgrade
- E.
Apt-get dist-upgrade
Correct Answer
D. Apt-get upgradeExplanation
To automatically upgrade all installed packages to the latest available
version, issue the following command:
apt-get upgradeRate this question:
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- 40.
You want to install a new software package, but it is only available inRPM format and you are running Debian Linux. Which of the followingwould help you to install it on your system?
- A.
Alien
- B.
Apt-conf
- C.
Dselect
- D.
Cpio
Correct Answer
A. AlienExplanation
alien is a program that converts between Redhat rpm, Debian deb,
Stampede slp, Slackware tgz, and Solaris pkg file formats. If you want to use a
package from another linux distribution than the one you have installed on your
system, you can use alien to convert it to your preferred package format and install
it. It also supports LSB packages.Rate this question:
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- 41.
What is a reasonable command to uninstall a Debian package from your system?
- A.
Dpkg -Ra pkgname
- B.
Dpkg -R pkgname
- C.
Dpkg -r pkgname
- D.
Dpkg -ra pkgname
Correct Answer
C. Dpkg -r pkgnameExplanation
dpkg ?r | ??remove
Remove an installed package. ?r or ??remove remove everything except configuration
files. This may avoid having to reconfigure the package if it is reinstalled later.Rate this question:
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- 42.
What command will uninstall a package but leave its configurationFiles in case a package is re-installed?
- A.
None, no command will do this
- B.
Dpkg -s pkgname
- C.
Dpkg -L pkgname
- D.
Dpkg -P pkgname
- E.
Dpkg -r pkgname
Correct Answer
E. Dpkg -r pkgnameExplanation
To remove an installed package, use the command
dpkg --remove package or dpkg -r packageThis command does not remove package
configuration files, which may facilitate subsequent re-installation of the package. If you
want to remove the configuration files as well, use the command:dpkg --purge packageRate this question:
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- 43.
How do you get a list of files that have been installed from a dpkg package?
- A.
Dpkg -l pkgname
- B.
Dpkg -C pkgname
- C.
Dpkg -s pkgname
- D.
Dpkg -S pkgname
- E.
Dpkg -L pkgname
Correct Answer
E. Dpkg -L pkgnameExplanation
To list the files installed from a specified package, issue the command: dpkg --listfiles package or dpkg -L packageRate this question:
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- 44.
Which utility can be used to convert a .rpm package to .deb packageformat? (Without arguments)
Correct Answer
alienExplanation
alien is a program that converts between Redhat rpm, Debian deb, Stampede slp,
Slackware tgz, and Solaris pkg file formats. If you want to use a package from another
linux distribution than the one you have installed on your system, you can use alien to
convert it to your preferred package format and install it. It also supports LSB packages.Rate this question:
- 45.
What is the difference between the -remove and the -purge action with the dpkgcommand?
- A.
Remove removes the program, -purge also removes the config files
- B.
Remove only removes the program, -purge only removes the config files
- C.
Remove removes a package, -purge also removes all packages dependent on it
- D.
Remove removes only the package file itself, -purge removes all files related to the package
Correct Answer
A. Remove removes the program, -purge also removes the config filesExplanation
-r or --remove remove everything except configuration files. This
may avoid having to reconfigure the package if it is reinstalled later. (Configuration
files are the files listed in the debian/conffiles control file). ?P or ??purge removes
everything, including configuration files. If -a or --pending is given instead of a package name, then all packages unpacked, but marked to be removed or purged in file /var/lib/dpkg/status, are removed or purged, respectively.Rate this question:
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- 46.
The ______ command is typically used to search files for a specified string.
Correct Answer
grepExplanation
grep command prints lines of files where pattern is matched.
Eg: grep root /etc/passwd à will display all lines from /etc/paswd matching the root pattern.Rate this question:
- 47.
You need to remove the rpm package Certkiller regardless of dependencies, type thecommand with switches that will do this?
Correct Answer
rpm -e Certkiller --nodeps
rpm -e --nodeps CertkillerExplanation
To remove the package we can use the -e or --erase option. To remove
or install or upgrade the package without checking the dependencies -nodeps option
is used.
So,
rpm -e --nodeps Certkiller
rpm -erase nodeps CertkillerRate this question:
- 48.
What RPM command would show you detailed information for a package calledopenssh-3.6.i386.rpm?
- A.
Rpm --showinformation openssh-3.6.i386.rpm
- B.
Rpm -- showdetails openssh-3.6.i386.rpm
- C.
Rpm -qi openssh-3.6.i386.rpm
- D.
Rpm -- verify openssh-3.6.i386.rpm
Correct Answer
C. Rpm -qi openssh-3.6.i386.rpmExplanation
-qi option queried and display the information about the package.Rate this question:
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- 49.
After a minor security incident you are instructed by your lead sys-admin to verifythe RPM's installed on running system. Which command will create a completereport which you can analyze for changes which may be security related?
- A.
Rpm -Va>report
- B.
Rpm -Qavy > report
- C.
Rpm -Vqt-- nomd5>report
- D.
Rpm -checkfiles >report
- E.
Rpm -Va-nofiles > report
Correct Answer
A. Rpm -Va>reportExplanation
Verifying a package compares information about the installed files in the package with information about the files taken from the package metadata
stored in the rpm database. Among other things, verifying compares the size, MD5
sum, permissions, type, owner and group of each file. Any discrepancies are
displayed.
To verify the package:
rpm -Va or -verify -a packagenameRate this question:
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- 50.
You need to know where all the configuration files for the installed package named"postfix" are located. Assuming it was installed with rpm, which command will list this information for you?
- A.
Rpm -qc postfix
- B.
Rpm -Vc postfix
- C.
Prm --config postfix
- D.
Rpm -listconfig postfix
- E.
Prm -qa --config postfix
Correct Answer
A. Rpm -qc postfixExplanation
To list the configuration files of installed package: rpm -qc or -q
--configfiles packagename. To list all belongs to installed package: rpm -ql or -q
--list packagenameRate this question:
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