Linux+ Linux+ Basic Bash Scripting 3

Question 1

What does the `chmod +x script.sh` command do?

Accepted Answer

Adds execute permission to the script

Answer

chmod +x adds the execute bit for the owner, group, and others, allowing the file to be run as a program.

Question 2

In a while loop, what does `while read line` typically read from?

Accepted Answer

Standard input or a piped/redirected source

Answer

while read line reads one line at a time from stdin, which is often piped or redirected from a file.

Question 3

Which arithmetic expression syntax is native to Bash and avoids spawning a subshell?

Accepted Answer

$(( 3 + 2 ))

Answer

$(( )) is Bash's built-in arithmetic expansion, evaluating expressions without forking an external process.

Question 4

What happens when you use `set -e` at the top of a Bash script?

Accepted Answer

The script exits immediately when any command returns a non-zero status

Answer

set -e (errexit) causes the script to terminate as soon as any command exits with a non-zero status.

Question 5

Which syntax correctly passes all positional parameters as individual quoted arguments to another command?

Accepted Answer

"$@"

Answer

"$@" expands each positional parameter as a separate quoted word, preserving spaces within arguments.

Linux Practice Test