Date: Sun, 17 Mar 2002 20:33:04 -0600 (CST) From: hawkeyd@visi.com (D J Hawkey Jr) To: parv_@yahoo.com, freebsd-questions@freebsd.org Subject: Re: awk - any possibility of using a variable in regex Message-ID: <200203180233.g2I2X4n22005@sheol.localdomain> In-Reply-To: <20020317223910.GA3245_moo.holy.cow@ns.sol.net> References: <20020317223910.GA3245_moo.holy.cow@ns.sol.net>
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In article <20020317223910.GA3245_moo.holy.cow@ns.sol.net>,
parv_@yahoo.com writes:
> is it impossible to use a variable inside a regex in awk? i tried
> the following w/o any success...
>
> { echo 'polka dot'; echo 'red dot'; } | \
> awk -v type=polka ' BEGIN { dot_type=type } /dot_type/ { print }'
>
> ...so i had resorted to perl for now.
>
> actual usage is to kill X applications -- xinit, startx -- (from
> /usr/share/skel/dot.xinitrc)...
>
> [SNIP]
Hey, I could use something like this!
I don't know if awk REs support variables - I played with your example
some, and it doesn't do anything for me - but I can make your script a
little more efficient by eliminating the perl. Try something like this:
---8<---
#!/bin/sh
TMP=/var/tmp/$0.$$
teststop ()
{
[ `ps -aO ruser |egrep $LOGNAME.+$1 | grep -v grep | tee $TMP | wc -l` -eq 1 ] && kill -9 `cat $TMP | awk '{ print $1 }'`
rm -f $TMP
}
teststop startx
teststop xinit
--->8---
A little more time and creativity could pro'lly eliminate the temporary
file, and maybe the awk, too.
> - parv
Hope this helps,
Dave
--
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