Date: Thu, 13 Jan 2011 13:30:24 -0800 From: Devin Teske <dteske@vicor.com> To: Robert Bonomi <bonomi@mail.r-bonomi.com> Cc: f.bonnet@esiee.fr, freebsd-questions@freebsd.org Subject: Re: problem with shell script Message-ID: <1294954224.10908.9.camel@localhost.localdomain> In-Reply-To: <201101132045.p0DKj43V027817@mail.r-bonomi.com> References: <201101132045.p0DKj43V027817@mail.r-bonomi.com>
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On Thu, 2011-01-13 at 14:45 -0600, Robert Bonomi wrote:
> > Date: Wed, 12 Jan 2011 15:01:45 +0100
> > From: Frank Bonnet <f.bonnet@esiee.fr>
> > Subject: problem with shell script
> >
> > Hello
> >
> > I'm in trouble with a simple shell script that give erroneous value when
> > running ...
> >
> > If I run commands interactively everything runs well
> >
> > > ps ax | grep slapd | grep -v grep | wc -l
> > 1
> >
> > If I run in the following shell script :
> >
> > #!/bin/sh
> > SD=0 SD=`ps -ax | grep slapd | grep -v grep | wc -l` echo $SD
> >
> > the result is 3 !!!
>
> Advice: don't try to 'out-think' the machine -- make it _show_ you what it
> is doing.
Might I suggest the oft-overlooked "o" option to ps(1)...
ps axo ucomm | grep -c slapd
I can't think of anything better to achieve what the OP wanted.
Naturally... for those that need more (that is, if you want to see
meaningful output rather than just the line-count)...
try:
ps axo pid,state,ucomm
or:
ps axo pid,command | awk '$2~/slapd/{print}'
naturally, for ``wider'' output:
ps axwwwo pid,command | awk '$2~/slapd/{print}'
And the creme-de-la-creme:
ps axwwwo pid,command | awk '$2~"^slapd$"||$2~"/slapd$"{print}'
which will only print a line if the first word of the entire command is
wholly "slapd" or ends in "/slapd".
Additional solutions/combinations left as an exercise to the reader.
--
Devin
(full sig at bottom)
>
> Change the script to:
> SD=`ps -ax | grep slapd | grep -v grep | tee /dev/tty | wc -l` echo $SD
>
>
> I suspect thet the -name- of the script file has 'slapd' in it.
>
>
>
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--
Cheers,
Devin Teske
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