Linux Plus V7 Bash Automation Tasks Quiz

1. What is the purpose of the 'trap' command in Bash scripts?

Catch and handle signals or errors

Trace command execution

Trap variables in memory

Trap input from users

2. Which command removes the first occurrence of a pattern in lines?

Sed 's/pattern/replacement/'

Awk '{gsub(/pattern/, "replacement")}'

Grep -v pattern

Cut -d pattern

3. In a Bash if statement, what does [[ ]] provide over [ ]?

Support for regex and logical operators

Faster execution speed

Compatibility with POSIX shell

Extended file testing

4. What does 'grep -i pattern file' do?

Searches for pattern case-insensitively

Searches for pattern inversely

Shows line numbers with matches

Searches in multiple files

5. Which command schedules a task to run at a specific time?

Cron

At

Crontab

Both b and c

6. How do you make a variable available to child processes?

Export variable=value

Set variable=value

Declare variable=value

Global variable=value

7. What does 'ps aux' display?

All running processes with detailed information

Only user processes

Process scheduling information

Process memory allocation

8. Which variable expands to all positional parameters as separate words?

$@

$*

$0

$!

9. What does the 'read' command do in a Bash script?

Reads a line of input into a variable

Reads file permissions

Reads process status

Reads command history

10. Which syntax creates a function in Bash?

Function name() { commands; }

Def name(): commands

Func name { commands }

Define name(commands)

11. Which command substitution syntax is preferred in modern Bash scripts?

$(command)

`command`

{command}

[command]

12. In Bash, what does 'test -f file' check?

If file is a regular file

If file is executable

If file is a directory

If file is readable

13. Which command finds and executes a command on multiple files?

Find . -exec command {} \;

Grep -r pattern

Sed 's/old/new/g'

Awk '{print $1}'

14. What does the chmod command '755' grant on a file?

Rwx for owner, rx for group and others

Rw for owner, r for group and others

Rwx for all users

Rx for owner only

15. Which loop construct is best for iterating over array elements?

For ((i=0; i

For item in ${array[@]}

While read line

Until condition

16. How do you redirect both stdout and stderr to the same file?

Command > file 2>&1

Command 2> file 1> file

Command >> file 2>> file

Command &> file | file

17. What is the purpose of the 'set -e' command in a Bash script?

Exit immediately if any command exits with non-zero status

Enable extended pattern matching

Set environment variables

Execute commands in sequence

18. Which operator is used for arithmetic expansion in Bash?

$(( ))

$[ ]

Let

All of the above

19. In a Bash script, what does $# represent?

The script's process ID

The number of positional parameters

The exit status of the last command

The current working directory

20. What does the -x option do when running a Bash script?

Executes the script in debug mode

Enables extended globbing

Exports all variables

Exits on first error