010-160 Linux Command Line & Shell Scripting 2

Question 1

Which shell built-in command displays the value of a variable named MYVAR?

Accepted Answer

echo $MYVAR

Answer

The echo command followed by the variable name prefixed with $ displays its value.

Question 2

What does the pipe operator | do in a shell command?

Accepted Answer

Sends the output of one command as input to another

Answer

The pipe | connects the stdout of the left command to the stdin of the right command.

Question 3

Which command lists only the directories inside /home?

Accepted Answer

ls -d /home/*/

Answer

ls -d /home/*/ matches only directory entries by appending a trailing slash glob.

Question 4

In a bash script, what does the special variable $? represent?

Accepted Answer

The exit status of the last command

Answer

$? holds the exit code returned by the most recently executed foreground command.

Question 5

Which command would you use to search for the string 'error' in all .log files under /var/log?

Accepted Answer

grep -r 'error' /var/log/*.log

Answer

grep with a pattern and a file glob searches for matching text within the specified files.

(010-160) LPI Linux Essentials Practice Test