$ which usb $ ps auxf | grep usb 1000 2388 0.0 0.0 4384 840 pts/0 S+ 11:02 0:00 | \_ grep --color=auto usb
$ which usb
$ ps auxf | grep usb
1000 2388 0.0 0.0 4384 840 pts/0 S+ 11:02 0:00 | \_ grep --color=auto usb