RHCSA RHCSA Essential Command-Line Tools 5

Question 1

Which command extracts a tarball named 'backup.tar.gz' into the current directory?

Accepted Answer

tar -xzf backup.tar.gz

Answer

tar -xzf extracts (-x) a gzip-compressed (-z) archive from the specified file (-f).

Question 2

What does 'ps aux' show?

Accepted Answer

All running processes for all users with detailed info

Answer

ps aux uses BSD-style flags to show all processes (a), user-oriented format (u), and processes not attached to a terminal (x).

Question 3

Which command sends signal 9 (SIGKILL) to a process with PID 1234?

Accepted Answer

kill -9 1234

Answer

kill -9 PID sends the SIGKILL signal which immediately terminates the process without cleanup.

Question 4

What does the 'df -h' command display?

Accepted Answer

Disk space usage of mounted filesystems in human-readable form

Answer

df reports filesystem disk space usage, and -h formats sizes with KB/MB/GB units for readability.

Question 5

Which command shows disk usage of the current directory and its subdirectories?

Accepted Answer

du -sh *

Answer

du -sh * shows the summarized (-s) human-readable (-h) disk usage of each item in the current directory.

RHCSA Exam Practice Test