Useful Commands/System Management

情境	指令
List process	ps -axo pid,command ps -axo pid,command | awk 'match($2, /^ssh/) { print $0; }' ps -axo pid,command | awk 'match($2, /^login/) { print $0; }' ps -axo pid,command | awk 'match($2, /^-?bash/) { print $0; }'
List process tree	# Mac/BSD pstree -p 713 pstree $(ps -axo pid,command | awk 'match($2, /^login/) { print $1 }') # Linux pstree 713 pstree -p $(ps -acxo pid,command | awk '/sshd/{print $1}' | head -n 1) pstree -p $(ps -acxo pid,command | awk '/bash/{print $1}' | tail -n 2 | head -n 1)
CPU & Memory	# Linux cat /proc/cpuinfo cat /proc/meminfo free
Locale	locale # current locale locale -a # available locales sudo locale-gen # rebuild locales
Run a command one minute later	echo "ls -l > `tty`" | at now + 1 minute