How do I effectively use variables and control structures in Bash scripting?

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Here are the Bash scripting multiple-choice questions (MCQs) with their respective answers:

What command is used to comment out lines in a Bash script?
a) #
b) //
c) —
d) /* */
Answer: a) #

Which command is used to display the contents of a file in the terminal?
a) cat
b) echo
c) ls
d) read
Answer: a) cat

In Bash scripting, what symbol represents the home directory?
a) ~
b) *
c) $
d) /
Answer: a) ~

Which command is used to assign the output of one command as an input to another command?
a) pipe (|)
b) redirect (> or >>)
c) concat (+)
d) chain (;)
Answer: a) pipe (|)

What does the ‘chmod +x script.sh’ command do in Bash?
a) Adds execute permission to script.sh
b) Removes execute permission from script.sh
c) Changes ownership of script.sh
d) Renames script.sh
Answer: a) Adds execute permission to script.sh

Which command is used to read user input in a Bash script?
a) input
b) get
c) read
d) scan
Answer: c) read

What is the purpose of the ‘if’ statement in Bash scripting?
a) Loop through a block of code
b) Define a function
c) Execute a block of code if a condition is true
d) Print output to the terminal
Answer: c) Execute a block of code if a condition is true

Which symbol is used for appending text to the end of a file in Bash?
a) >
b) >>
c) << d) + Answer: b) >>

What does the ‘grep’ command do in Bash?
a) Count the number of lines in a file
b) Display disk usage statistics
c) Search for patterns in files
d) List all files in a directory
Answer: c) Search for patterns in files

Which command is used to create a directory in Bash?
a) newdir
b) create
c) mkdir
d) touch
Answer: c) mkdir