How to crontab screen with script inside and a "don't run it if it's already running" check?

[Dwayne Henderson]

Hello Jens!

Nice. But what to do if the machine reboots or whatever. Would you crontab
your new Irssi alias?

--Dwayne

On Fri, Jun 1, 2012 at 9:39 PM, Jens Jahnke <jan0sch at gmx.net> wrote:

> Hi,
>
> On Fri, 1 Jun 2012 20:55:00 +0200
> Dwayne Henderson <its.code.in.here at gmail.com> wrote:
>
> DH> I run this Ruby script 24/7 (records data from this live stream).
> DH> It runs inside a screen though, so it's easy to check in on it
> DH> every once in a while.
> DH>
> DH> But how do I crontab the screen with the script inside it? It has
> DH> to be with a "don't run it if it's already running" check.
> DH> [...]
>
> maybe you should create a shell alias. I do the following for my irssi
> session:
>
> # Start irssi within screen or switch to it if it is already running.
> alias irssi='if pgrep -u $USER irssi;then screen -U -x irssi;else screen
> -S irssi irssi;fi'
>
> Regards,
>
> Jens
>
> --
> 01. Brachet 2012, 21:37
> Homepage : http://www.jan0sch.de
>
> It is a sobering thought that when Mozart was
> my age, he had been dead for 2 years.
>                -- Tom Lehrer
>