Executing Linux Command in Java

Question

I'm trying to execute the following Command in Java in order to kill the spawned process of bash script which is executed through java :

kill $(pgrep -P $(pgrep -P 5537))

I'm using apache Commons Exec Commandline to build the Command but it's no different to using ProcessBuilder here. So here is what I have so far:

CommandLine cmdLine = new CommandLine("bash");
cmdLine.addArgument("-c");
cmdLine.addArgument("kill $(pgrep -P $(pgrep -P "+pid+"))");

I get the error

bash: $'kill 7940\n7941\n7942\n7943': Command not found.

Normally I would now try to get the newlines out of the Command but it also doesn't work to kill just a single process because then I get the error :

bash: kill 7980: Command not found.

One the one hand I need to use bash to use the variables and on the other hand I can't use it because kill can't be executed with it...

How are you going to programmatically fetch the pid and give it to a Java file? That's the first thing to solve. — Arham
– Arham, Commented Oct 19, 2012 at 9:10

Aniket Inge · Accepted Answer · 2012-10-19 09:03:55Z

1

firstly kill -9 pidnumber

Why would you need the bash variables? when java gives you strings to store variables?

Thirdly why not try System.Runtime.getRuntime().exec() ?

Also do you have permissions to kill the task? tried sudo kill -9 pid?

answered Oct 19, 2012 at 9:03

Aniket Inge

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1 Comment

nico1510 Over a year ago

why use java variables when I can use bash variables? I would have to execute runtime.exec serveral times if I used java variables. Anyway Runtime.getRuntime().exec(new String[]{"bash","-c","kill $(pgrep -P $(pgrep -P "+pid+"))"}); did it for me thanks ;)

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