Linux+ CompTIA Linux+ Linux GNU and Unix Commands 2

Question 1

Which command displays the last 20 lines of a file named 'syslog'?

Accepted Answer

tail -20 syslog

Answer

tail -n 20 (or tail -20) displays the last 20 lines of a file.

Question 2

A sysadmin wants to find all files modified in the last 2 days. Which find option is correct?

Accepted Answer

-mtime -2

Answer

find -mtime -2 matches files with modification time less than 2 days ago.

Question 3

Which command shows disk usage of the current directory in human-readable format?

Accepted Answer

du -sh .

Answer

du -sh . summarizes (-s) disk usage of the current directory in human-readable (-h) format.

Question 4

What does the command 'chmod 755 script.sh' set for group permissions?

Accepted Answer

read and execute

Answer

In 755, the middle digit 5 (r-x) gives group read and execute permissions.

Question 5

Which command is used to rename a file in Linux?

Accepted Answer

mv

Answer

mv (move) is used to rename files by moving them to a new name in the same directory.

Linux Practice Test