RHCSA RHCSA Shell Scripting and Automation 3

Question 1

Which command redirects both stdout and stderr to a file called `output.log`?

Accepted Answer

command > output.log 2>&1

Answer

command 2> output.log

Answer

command >> output.log

Answer

command &> output.log 1>&2

Question 2

In Bash, what does the `test -f /etc/passwd` command check?

Accepted Answer

Whether /etc/passwd exists and is a regular file

Answer

Whether /etc/passwd is executable

Answer

Whether /etc/passwd is a directory

Answer

Whether /etc/passwd has read permission

Question 3

What does `#!/bin/bash -x` at the top of a script do?

Accepted Answer

Enables debug mode, printing each command before execution

Answer

Exits immediately on any error

Answer

Treats unset variables as errors

Answer

Runs the script in restricted mode

Question 4

Which construct in Bash allows you to define a reusable block of commands?

Accepted Answer

function

Answer

subroutine

Answer

procedure

Answer

module

Question 5

What is the purpose of `set -e` at the beginning of a Bash script?

Accepted Answer

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

Answer

Enable extended globbing

Answer

Echo every command before running it

Answer

Enforce read-only variables

Question 6

Which Bash arithmetic syntax correctly computes the sum of variables A and B?

Accepted Answer

$((A + B))

Answer

$(A + B)

Answer

${A + B}

Answer

expr(A + B)