Is a process running ?

Is a process running ?

[Tim Fletcher]

Hi all,

i would like to write a simple shell script that checks for the existence of a certain programme, in this case python2.1. if the
programme is active, do nothing, if not, start it.

i did think of doing a ps -A |grep python2.1, but then i have no idea how to intergrate that in the shell script.

any ideas would be very  welcome

Thanks & HAND
Tim

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RE: Is a process running ?

[Tim Fletcher]

Thanks very much, works great :)

Tim

> -----Message d'origine-----
> De : John T. Williams [mailto:jtwilliams@vt.edu]
> Envoyé : lundi 28 juillet 2003 15:14
> À : tfletcher@netfactoriel.com; Linux-Newbie@Vger. Kernel. Org
> Objet : Re: Is a process running ?
>
>
> Something like this would do it
>
> -------------------  pythstart.sh ----------------------
> #!/bin/bash
>
> ps -A | grep -e "[ /]python2.1\>" 1> /dev/null 2> /dev/null
>
> if[ $? != 0]; then
>     python2.1
> fi
>
> -----------------end pythstart.sh-----------------------
>
>
>
>
>
> ----- Original Message -----
> From: "Tim Fletcher" <tfletcher@netfactoriel.com>
> To: "Linux-Newbie@Vger. Kernel. Org" <linux-newbie@vger.kernel.org>
> Sent: Monday, July 28, 2003 2:20 AM
> Subject: Is a process running ?
>
>
> >
> > Hi all,
> >
> > i would like to write a simple shell script that checks for the existence
> of a certain programme, in this case python2.1. if the
> > programme is active, do nothing, if not, start it.
> >
> > i did think of doing a ps -A |grep python2.1, but then i have no idea how
> to intergrate that in the shell script.
> >
> > any ideas would be very  welcome
> >
> > Thanks & HAND
> > Tim
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.linux-learn.org/faqs
>

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Re: Is a process running ?

[John T. Williams]

Something like this would do it

-------------------  pythstart.sh ----------------------
#!/bin/bash

ps -A | grep -e "[ /]python2.1\>" 1> /dev/null 2> /dev/null

if[ $? != 0]; then
    python2.1
fi

-----------------end pythstart.sh-----------------------





----- Original Message ----- 
From: "Tim Fletcher" <tfletcher@netfactoriel.com>
To: "Linux-Newbie@Vger. Kernel. Org" <linux-newbie@vger.kernel.org>
Sent: Monday, July 28, 2003 2:20 AM
Subject: Is a process running ?


>
> Hi all,
>
> i would like to write a simple shell script that checks for the existence
of a certain programme, in this case python2.1. if the
> programme is active, do nothing, if not, start it.
>
> i did think of doing a ps -A |grep python2.1, but then i have no idea how
to intergrate that in the shell script.
>
> any ideas would be very  welcome
>
> Thanks & HAND
> Tim
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-newbie" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.linux-learn.org/faqs

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Re: Is a process running ?

[Kees Cook]

John T. Williams wrote:
> ps -A | grep -e "[ /]python2.1\>" 1> /dev/null 2> /dev/null

A quick short-cut for the last part:

ps -A | grep -e "[ /]python2.1\>" >/dev/null 2>&1

"1" (stdout) is used by default, and then 2>&1 takes "2" (stderr) and 
sends (>) it to the same location (&) as "1".

-- 
Kees

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