Manejar procesos en linux

top
htop
    sudo apt-get install htop

ps
    ps -A
    ps -A | less
    ps -A | grep firefox

pstree

kill
    kill PID

pgrep
    pgrep firefox

pkill
    pkill firefox

killall
    killall firefox

renice
    renice 19 PID
    sudo renice -19 #

xkill

Fuente: http://www.howtogeek.com/107217/how-to-manage-processes-from-the-linux-terminal-10-commands-you-need-to-know/