Thread: Calling lockf from the shell line works fine, but in the script, it fails

It seems silly to me to use a perl script just to issue shell commands; why don't you put them in a shell script?

To lock a file in perl use flock().

Originally Posted by Overworked_PhD

I'd still get the same results and hence it wouldn't solve my current problem.

are you saying that this

Code:

#!/bin/bash

lockf -t 30 /usr/party/log/party.log sleep 30

will not execute EXACTLY as if you had typed it into the command-line? Because I don't believe you!

I do not have a "lockf" command on my system, so I can't help you with the syntax*, but shell scripts are executed by the shell one line at a time. If it works on the command line, it will work in a shell script. Here:

Code:

!/bin/bash

if grep "bash" | grep "cdalten" > /dev/null
    then lockf -t 30 /usr/party/log/party.log sleep 30
    else echo "not logged in"
fi

The purpose of "> /dev/null" is to spare you the grep output on screen.

*eg, I'm assuming "sleep 30" at the end is a parameter and not a typo for "&& sleep 30"

Originally Posted by Overworked_PhD

Your script only works after I press ctrl-c. I'm assuming the process is doing some kind of forking that I'm not aware of.

Code:

cat textfile | thatscript.sh
or
thatscript.sh < textfile

Sorry, it was intended to process input, I thought that was clear.