[Gllug] Single instance of a process - simple way

[Ziya Suzen]

Hi there

I was going to ask if there was a simple shell lock utility where I
can use to ensure single instance of a process is run.. but I found
one as I was typing the mail:

"chiark-utils -> with-lock-ex: a simple tool for acquiring a lockfile
before running another program or script."

Anyway, question is changed a little: now I am wondering if you know
any other utilities like with-lock-ex. Maybe one with retries and
time-outs for example.

I have quite a few rsync cronjobs and I would like to run them as
often as possible. But I don't want them to collide, in case one of
the jobs is taking longer than the defined job frequency BTW, I am on
Ubuntu-Server 7.04 Feisty Fawn.

Cheers

--Ziya
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