UNIX for Advanced & Expert Users

Dude,

I want to kill a process, but the processid is in a text file. I have to read the text file for the process id and pass it as parameter to the kill command.

Example
$ cat prcid.txt
18650

I want to pass the value 18650 as a process id to kill command.

$ kill -9 <value read from the prcid.txt file>

The complete statement should be something like this...
$ cat prcid.txt | kill -9 <processid from txt file>

Thanks,
Muralee

kill -9 $(cat file)

The $(....) construct spawns a subshell and expands to the output of the shell, much like "$var" would expand to the content of the variable var.

You can even put several commands inside, like here:

Code:

if [ $(some_command >/dev/null ; print - $?) -gt 0 ] ; then
     print - "the return code was greater zero"
else
     print - "the return code was zero"
fi

I hope this helps.

bakunin

Thanks for the reply. But things are not over....

To get more detailed, prcid.txt file has two process ids like below:
$ cat prcid.txt
18734 18733 prstat

First one (18734) is pid and the other is (18733) is ppid, so i want to pass arugment to kill as below to terminate the process and the parent process.

$ kill -9 pid -ppid.

I want to do some thing like below

$ kill -9 $(cat prcid.txt | cut -d" " -f1) -$(cut prcid.txt | cut -d" " -f2)

Thanks,
Muralee

Didn't you just solve the problem yourself?

Thanks dudes problem solved.