An idea! was...Re: [K12OSN] opening too many programs blanks screen K12LTSP

[Darryl Palmer]

On 10/27/06, David Trask <dtrask at vcsvikings.org> wrote:
>
> How could one write a script that could then become a launcher or menu
> item that would poll the system to see if that program was already running
> under the logged on user....if not....then launch the program....if
> yes....then abort.  This might make it easier to keep kids from going
> "click happy" and opening multiple instances of a program.  Any ideas?
>

You can use lockfile to do this, you can write something like

#! /bin/bash

#Check to see if the lockfile exits
if lockfile -! -r 0 ~/.locks/lockfile-firefox; then
  echo "Unable to start firefox, lock file exists"
  exit 1
fi

firefox

rm -f ~/.locks/lockfile-firefox




You need to create a .locks subdirectory for each user, then you can erase
all the locks at once.  You can also stick them in the temporary directory
instead.


Darryl
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