LFCS Certification Shell Scripting and Automation

Question 1

What is the purpose of the shebang line (e.g., #!/bin/bash) at the top of a shell script?

Accepted Answer

It specifies the interpreter to use when executing the script

Answer

It adds a comment describing the script purpose

Answer

It sets the script's execution permissions automatically

Answer

It defines the shell's PATH variable for the session

Question 2

Which command makes a shell script executable for the file owner, group, and others?

Accepted Answer

chmod +x script.sh

Answer

chmod 644 script.sh

Answer

chmod 400 script.sh

Answer

chmod 600 script.sh

Question 3

What is the correct bash syntax to check if the integer variable $NUM equals 10?

Accepted Answer

if [ $NUM -eq 10 ]

Answer

if [ $NUM = 10 ]

Answer

if ($NUM == 10)

Answer

if { $NUM -eq 10 }

Question 4

Which special variable holds the exit status of the most recently executed command?

Accepted Answer

$?

Answer

$0

Answer

$#

Answer

$$

Question 5

What is the correct way to assign the string 'admin' to the variable USERNAME in bash?

Accepted Answer

USERNAME='admin'

Answer

set USERNAME = 'admin'

Answer

$USERNAME = 'admin'

Answer

let USERNAME = 'admin'

Question 6

What does the built-in `read` command do when used in a bash script?

Accepted Answer

Reads a line of input from stdin and stores it in a variable

Answer

Reads the contents of a file into memory for processing

Answer

Displays the current value of a named variable

Answer

Reads environment variables from /etc/environment

Question 7

Which bash loop construct iterates over each word in a space-separated list?

Accepted Answer

for item in list; do ... done

Answer

while item in list; do ... done

Answer

loop item list; do ... done

Answer

foreach item in list; do ... done