How can I kill Firefox by console?

note: do not use kill -9 unless you have tried everything else. always try kill (without -9) first. for more explanation see this question and answers: https://unix.stackexchange.com/questions/8916/why-not-kill-9-a-process.

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the command to script-kill processes is pkill and killall. see the wikipedia page of pkill and killall for more details.

I will provide some examples for pkill. killall works similar to pkill.

pkill -f firefox

This will kill all processes which have the string 'firefox' in the command.

Note that this will kill all processes which have the string firefox in the command.

For example if you have a gedit open editing a file called firefox.txt like this:

$ gedit firefox.txt &
$ pgrep -fl firefox
10959 gedit firefox.txt
30077 /usr/lib/firefox/firefox-bin
30123 /usr/lib/firefox/plugin-container /usr/lib/adobe-flashplugin/libflashplayer.so 30077 plugin true

Then doing a pkill -f firefox will also kill the gedit process.

You can prevent this by telling pkill to kill only exact matches using pkill -x /usr/lib/firefox/firefox-bin. killall has the switch -e which has the same effect.

You can create an alias in bash:

alias kf='pkill -f firefox'

Now you can use kf to kill firefox.