Linux CLI cheatsheet

Processes and how to kill them

Show all processes

$ ps aux

$ top

$ htop

Finding the parent of a process

$ ps -o ppid=<PID>

Finding the command that started a process

$ cat /proc/<PID>/cmdline

Kill by PID

$ kill -9 <PID>

Kill by exact name

$ killall -9 <NAME>

Kill by partial name

$ pkill -9 <PARTIAL>

Monitoring space usage & cleaning up

Disk space total

$ df -h

Disk space of directory

$ sudo du -sh /path

Disk space of subdirectories

$ sudo du -h /path -d 1

(Ubuntu) Cleaning up packages

sudo apt-get clean
sudo apt-get autoremove

(Ubuntu) Check /var/log/journal size

$ sudo journalctl --disk-usage

(Ubuntu) Only retain 50M of journal

$ sudo journalctl --vacuum-size=50M