From: culliton@srg.af.mil (Tom Culliton x2278)
To: rc@archone.tamu.edu
Subject: Match operator puzzlement
Date: Fri, 31 Jan 1992 15:01:15 -0600 [thread overview]
Message-ID: <9201311601.aa02527@ceres.srg.af.mil> (raw)
Reply-To: srg!culliton@uunet.uu.net
OK maybe it's just 'cuz it's Friday but my poor brain refuses to come
up with a good answer to this one. While writing some fairly large and
complex rc scripts I had a requirement to match something against a
list of patterns specified at the command line and figured it'd be easy
give rc's ~ match operator.
The first attempt was something like this:
patterns=`{echo $1} # go from '*.o *.a' to (*.o *.a)
# lots of stuffto generate a list on file names....
for (i in $list) {
if (~ $i $patterns) {
dealwith $i
} else {
handle $i
}
}
Which didn't work as planned for semi-obvious reasons involving
re-scanning. This didn't distress me too much because I mostly
understood why after a bit of thought. The next most obvious thing to
try was somthing like this
patterns=$1 # we don't care if it's a list for this
# lots of stuff to generate a list on file names....
for (i in $list) {
if (eval ~ $i $patterns) { # etc...
OOPS! I encountered a file name with a $ in it so make that
if (eval ~ '$i' $patterns) { # etc...
But what about patterns with $ and so forth in them? If we make
$patterns a list again and say '$patterns' to protect against that, we
get literal matching. I haven't been able to find a way out of the
swamp here any words of wisdom would be appreciated.
Thanks for listening.
Tom
next reply other threads:[~1992-01-31 21:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1992-01-31 21:01 Tom Culliton x2278 [this message]
1992-02-01 16:02 ` John Mackin
1992-02-01 17:49 Byron Rakitzis
1992-02-01 18:02 ` John Mackin
1992-02-01 18:43 malte
1992-02-01 19:46 malte
1992-02-02 20:20 Tom Culliton x2278
1992-02-03 17:09 Byron Rakitzis
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