LCA Shell Scripting & Automation 2

Question 1

Which construct is used in bash to iterate over a list of files matching a glob pattern?

Accepted Answer

for f in /etc/*.conf; do ...; done

Answer

The for loop with a glob pattern expands the pattern and iterates over each matching file.

Question 2

What does the `set -e` option do in a bash script?

Accepted Answer

Exits the script immediately if any command returns a non-zero exit status

Answer

`set -e` causes the shell to exit immediately when a command exits with a non-zero status.

Question 3

Which command reads a line of input from the user and stores it in a variable named REPLY?

Accepted Answer

read

Answer

The `read` command without a variable name stores input in the default variable $REPLY.

Question 4

In a bash script, what is the value of `$?` after a command succeeds?

Accepted Answer

0

Answer

A zero exit status ($?) indicates that the previous command completed successfully.

Question 5

What does `trap 'rm -f /tmp/lockfile' EXIT` accomplish in a script?

Accepted Answer

Removes the lockfile when the script exits for any reason

Answer

The `trap ... EXIT` command registers a cleanup handler that runs whenever the script exits, including on error or signal.

(LCA) Certified Linux Administrator Practice Test