kill < file (Feeding kill from file), PID, <, awk, grep

[jaffd]

Hi, In a script I have written, I have extracted a couple of processes by using (ps -ef) and (grep) and placed them in a file called (kill_PID). Then after using (awk) I am left with 2 PID's that I need to feed to (kill) command. Here is the scenario simplified:

File called (kill_PID) has 1 column with 2 values, lets give them the following values:

9645
9646

What do I need to add to my script in order to extract these to values from file (kill_PID) and feed them into kill command in order to kill both PID's.

I tried

kill < kill_PID

But this did not work. Feedback is appreciated.

Thanks

[Rubberman]

When you extract the PID's to kill, add "kill " before the PID in "kill_PID". Then you just need to source it, as in ". kill_PID"

Your kill_PID file would look like this:

kill 9645
kill 9646

[Cabhan]

Sourcing this is kind of a bad idea. Sourcing is more designed for importing variable definitions into the current session.

I also disagree with adding kill to the file.

If you have a list of PIDs and want to kill each of them, things are actually fairly simple:

#!/bin/bash

while readline pid; do
    kill "$pid"
done

You would call this script as:

./kill_script < kill_PID

This script reads each line of its input and then runs kill with that PID.

Do you understand how this script works?

[Rubberman]

Sourcing this is kind of a bad idea. Sourcing is more designed for importing variable definitions into the current session.

I also disagree with adding kill to the file.

If you have a list of PIDs and want to kill each of them, things are actually fairly simple:

#!/bin/bash

while readline pid; do
    kill "$pid"
done

You would call this script as:

./kill_script < kill_PID

This script reads each line of its input and then runs kill with that PID.

Do you understand how this script works?

I would agree that yours is the better approach. It does the same thing, as well as having the ability to have input piped from the output of another program.