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how to retrieve the value of ps - A command

baran tamer
Ranch Hand

Joined: Jan 22, 2009
Posts: 33
Hello , i am trying to get the pid of a process which i know is unique

My code below is not working for "ps - A | grep vlc" , however it works for "ifconfig"





output returns null . Any ideas ?
Dmitry Mamonov
Greenhorn

Joined: Dec 24, 2008
Posts: 28
Is it works with only:
String commandToBeExecuted = "ps -A";
?
Dmitry Mamonov
Greenhorn

Joined: Dec 24, 2008
Posts: 28


Code above works fine. May be grep command eliminates all rows?
Martijn Verburg
author
Bartender

Joined: Jun 24, 2003
Posts: 3274
    
    5

Hi there,

As an extra, have a read of the Javaworld article "Why Runtime.exec() won't", it's a very important set of guidelines when dealing with this sort of thing.


Cheers, Martijn - Blog,
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Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19684
    
  20

"ps - A | grep vlc" is not one command - it's two commands, with the output of the first used as input for the second.


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