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I want to kill all processes with the same name that belong to a user, for example:

$ps -u user_1
2345 myapp
2346 myapp
2347 myapp
2348 myapp2
2349 myapp

I want to kill all "myapp" processes that belong to "user_1", how can I do this?

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To kill all processes, use killall. I'm not kidding: man killall. –  cpast Jan 2 '13 at 7:14
    
Here's a link to a discussion on askubuntu that might answer your question. –  dinesh Jan 2 '13 at 7:45
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2 Answers

You can use the pkill command.

pkill -u user_1 myapp

Note that myapp2 won't be killed as it has a different name.

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use pkill command and wild cards

pkill -u user_name 'myap*'

it will kill all processes starting with myap.

"?" - matches 0 or 1 character

"*" - matches 0 or more character

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and @cpast is right. killall will do the same. –  Arpit Jan 2 '13 at 7:42
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