killall - kill processes by name.
Kill all processes by name:
killall firefox
Kill all processes by name ignoring case:
killall -I FireFox
Kill all processes by name asking for confirmation:
killall -i gimp
Kill all processes by name (quiet mode):
killall -q firefox
Kill all processes owned by a user:
killall -u james
Kill all processes by name and wait process to die:
killall -w firefox
Kill all processes running for more than 24 hours:
killall -o 24h
Kill all processes running for less than 1 hour:
killall -y 1h