[ale] bash pid

[Don Lachlan]

On Sat, Mar 27, 2010 at 9:57 PM, Richard Bronosky <Richard at bronosky.com> wrote:
> Don,
> An easier pattern than that awk is:
> grep '[u]niquestringofprocess'
>
> The [] won't match itself.

Richard,

That regex will exclude itself, but you still need to parse out the
pid from the string that grep returned, which is why I suggest awk.

-Don


>
> On 3/27/10, Don Lachlan <ale-at-ale.org at unpopularminds.org> wrote:
>> On Wed, Mar 24, 2010 at 12:25 PM, Jim Kinney <jim.kinney at gmail.com> wrote:
>>> I have a bash script that performs a sequence of tasks. I would like to be
>>> able to get the pid of the individual tasks for probable kill needs.
>>
>> Jim,
>>
>> Looking at your script and description, I don't understand what you're
>> trying to do, except that you're not using background processes. So...
>>
>> In cases where you're launching a daemon, you can use your system's
>> method for launching daemons.
>>
>> In Debian and Ubuntu, use start-stop-daemon
>> In OpenSuSE and SLES, use startproc
>> In CentOS and RHEL, use the functions in /etc/init.d/functions
>>
>> If you're looking for the PID of a foreground process, you cannot do
>> that from the parent process. From a separate process, you do want
>> 'ps' and 'awk':
>>
>> $ procpid=`ps -eo 'pid,args' | awk '/uniquestringofprocess/ && !/awk/
>> {print $1}'`
>>
>> -Lachlan
>>
>>
>>>
>>> For example:
>>>
>>> #!/bin/bash
>>>
>>> my_pid=$$  # get's the pid of the main script
>>>
>>> function do_sleep {
>>>  # sleeps in certain conditions
>>>  if [ <condition> ]; then sleep 2m; fi
>>> }
>>>
>>> for poo in $( <generated list of crap>); do
>>>  psql -c "vacuum freeze poo;"
>>>  do_sleep
>>> done
>>>
>>> So I need to be able to get the pid of the sleep and the psql. $! will
>>> give
>>> the pid of a backgrounded shell process but that's not making sense in the
>>> psql call case. Could run a ps |grep <cmd> and strip out the extra or even
>>> pidof <cmd> but all require putting things in a background state.
>>>
>>> --
>>> --
>>> James P. Kinney III
>>> Actively in pursuit of Life, Liberty and Happiness
>>>
>>>
>>> _______________________________________________
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>>>
>>
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>
> --
> Sent from my mobile device
>
> .!# RichardBronosky #!.
>
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