rm -r directory
#remove dir and all file

df -h

du

size of all file in current folder
du -sh *

linux history command
#history
history

#linux process
👇
to
curent user process
ps u

all user porcess
ps au

ps aux

ps aux | grep firefox

kill -9 process_id

kill -9
is kill imediatliy

killall process_name

#cpu
#ram

cat /proc/cpuinfo

cat /proc/process_id/

watch 'command'
run command every to second

watch -n 3 'command'

#run command evry second

linx shell
#zsh ubuntu

schedule job

at : run at future time
cron: recurring job in future

terminal

ls -lah
is equal
ld -l -h -a

ls -lhS

ls -a

ls -A
dos not show shortcut directories