RHEL frequently used commands

# Disk usage
du -sh /var/log/
# Example output
422M	/var/log/
# Options
-s, --summarize 
-h , --human-readable
-a, --all
--time
# Reference: https://www.redhat.com/sysadmin/du-command-options#:~:text=The%20du%20command%20is%20a,of%20many%20options%20or%20flags.