010-160 - LPI Linux Essentials Basic Scripting Concepts Questions and Answers

Question 1

A shell script contains the following lines:

MY_VAR="Linux System"
echo "I am learning about the '$MY_VAR'"
echo "I am learning about the \"$MY_VAR\""

What is the output when this script is executed?

Accepted Answer

I am learning about the '$MY_VAR'
I am learning about the "Linux System"

Answer

I am learning about the 'Linux System'
I am learning about the "$MY_VAR"

Answer

I am learning about the '$MY_VAR'
I am learning about the "$MY_VAR"

Answer

I am learning about the 'Linux System'
I am learning about the "Linux System"

Question 2

Which of the following lines in a script correctly executes the `whoami` command and assigns its output to a variable named `CURRENT_USER`?

Accepted Answer

CURRENT_USER=$(whoami)

Answer

CURRENT_USER='whoami'

Answer

let CURRENT_USER=whoami

Answer

CURRENT_USER->whoami

Question 3

What is the primary purpose of the `#!/bin/bash` line at the beginning of a shell script?

Accepted Answer

It specifies the absolute path to the interpreter that should execute the script.

Answer

It is a comment indicating the script's version number.

Answer

It sets the script's permissions to be executable by default.

Answer

It pre-loads all environment variables from the user's .bashrc file.

Question 4

A user creates a script named `greet.sh` with the content `echo "Hello, $1"`. How should the user execute this script to produce the output `Hello, David`?

Accepted Answer

./greet.sh David

Answer

echo "David" | ./greet.sh

Answer

David ./greet.sh

Answer

./greet.sh $1="David"

Question 5

After a command fails in a shell script, what is the most reliable way to check for this failure condition?

Accepted Answer

Check if the output of the `$?` variable is a non-zero value.

Answer

Check if the variable `$FAIL` is set to 1.

Answer

Check if the variable `$PID` is less than 0.

Answer

Check the system log for an error message with `dmesg`.

Question 6

A user has written a script file named `run_report.sh` but receives a "Permission denied" error when trying to execute it with `./run_report.sh`. The output of `ls -l` shows the permissions as `-rw-r--r--`. Which command will resolve this issue?

Accepted Answer

chmod +x run_report.sh

Answer

chown user run_report.sh

Answer

set-executable run_report.sh

Answer

run -a run_report.sh