≡ Menu

Kill Process In Ubuntu Linux

How can I kill a process using the bash command prompt? Do I always need to kill the process using PID?

To kill processes by name use the killall command. The syntax is as follows:

killall -SIGNAME process-name

The default signal for kill is TERM (terminate process). To list available signals, enter:
$ kill -l
The following are useful signals and used frequently by sys admins and Ubuntu users:

  1. SIGHUP (1) – Hangup detected on controlling terminal or death of controlling process.
  2. SIGINT (2) – Interrupt from keyboard.
  3. SIGKILL (9) – Kill signal i.e. kill running process.
  4. SIGSTOP (19) – Stop process.
  5. SIGCONT (18) – Continue process if stopped.

Examples – Ubuntu Linux: Killing Process

To kill all apache2 process, enter:
$ sudo killall -9 apache2
To kill all firefox process, enter:
$ sudo killall -9 firefox-bin
You can also use the pkill command as follows to kill all php-cgi process, enter:
$ pkill -KILL php-cgi
The -u option will kill only processes whose effective user ID is set to vivek:
$ sudo pkill -KILL -u vivek php-cgi

See also:

Share this tutorial on:

Your support makes a big difference:
I have a small favor to ask. More people are reading the nixCraft. Many of you block advertising which is your right, and advertising revenues are not sufficient to cover my operating costs. So you can see why I need to ask for your help. The nixCraft, takes a lot of my time and hard work to produce. If you use nixCraft, who likes it, helps me with donations:
Become a Supporter →    Make a contribution via Paypal/Bitcoin →   

Don't Miss Any Linux and Unix Tips

Get nixCraft in your inbox. It's free:

{ 4 comments… add one }
  • zzeroo December 16, 2010, 8:23 pm

    If you have a process name you can kill them via:

    # killall PROCESSNAME

    even better is the program pkill

    # pkill PROCESSNAME

    This kill all processes named PROCESSNAME.

  • Vladimir December 18, 2010, 7:51 pm

    kill -SIGKILL `pidof process-name`

  • Sourav April 7, 2012, 7:49 pm

    The last one worked for me

    Thank you Vladimir

  • Mutapa May 8, 2013, 4:14 pm

    Thanks a million. acroread was killing my machine and the killall -9 acroread did the trick. I can now work.

Security: Are you a robot or human?

Leave a Comment

You can use these HTML tags and attributes: <strong> <em> <pre> <code> <a href="" title="">

   Tagged with: , , , , , , , , , , , , ,