cheat_sheet.md

Cheat Sheet

Login as root

Change to root when login as any user with root privileged

sudo -i

List all users

cat /etc/passwd

Report file system disk space usage

df -h - will show each first level directory

or

df / -h - will show total

Check Command Path

whereis <command>

or

which <command>

Check Mime Type

file --mime-type -b <filename>

Other packages

Glances

Change file/folder Ownership

sudo chown -R username:group directory

Delete log file

When your /var/log folder become to big, is good to cleanup once a while,

Delete all log

find /var/log -type f -delete

Delete all .gz and rotated file

find /var/log -type f -regex ".*\.gz$"

find /var/log -type f -regex ".*\.[0-9]$"

Reference

• How to find out how much disk space is remaining?
• How do I determine the total size of a directory (folder) from the command line?
• How do I remove multiple files with a common prefix and suffix?
• Delete all of Var Log
• Find Top Large Directories and Files Sizes in Linux
• How to truncate all logfiles?
• Linux List All Users In The System