Date: Wed, 31 Dec 2003 01:33:53 +0000 From: Daniela <dgw@liwest.at> To: "Rob" <listone@deathbeforedecaf.net>, <questions@freebsd.org> Subject: Re: Complex quoting task in tcsh Message-ID: <200312310133.53578.dgw@liwest.at> In-Reply-To: <009801c3cdc9$88507280$a4b826cb@goo> References: <200312290334.25341.dgw@liwest.at> <009801c3cdc9$88507280$a4b826cb@goo>
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On Monday 29 December 2003 05:06, Rob wrote: > Daniela, > > This isn't the answer you would like, but tcsh is generally considered a > bad language for writing scripts*. It's an excellent command-line shell, > but scripts are not its strong point. > > One reason is the one you've just run into - quoting is a little flakey, > especially when you try to do something tricky. > > For 'basic' scripts, either sh(1) or ksh(1) is usually the way to go. As > an example, here's your line-checking question, using sh and FreeBSD > commands: > > cat somefile | while read LINE ; do > if echo "$LINE" | grep -q '^#' ; then > # do something with $LINE > fi > done Thanks a lot, that grep -q thing also works for tcsh. > For more complex work, perl or python are usually recommended. You can do lots of stuff with shellscript: look at user.berklix.org/~dgw > On the other hand, if you just want to filter the comments out of a > file, put > > grep -v '^#' > > at the start of your pipeline. > > * Csh Programming Considered Harmful (1996) > http://www.perl.com/pub/a/language/versus/csh.html Csh is not harmful at all -- it allows for great optimizing for certain tasks. > ----- Original Message ----- > From: "Daniela" <dgw@liwest.at> > Subject: Complex quoting task in tcsh > > > I'm writing a tcsh script and I can't figure out how to escape that #. > > I tried all possible variations, and it always says I have a syntax > > error. > > > Here's one: > > if ($line =~ "#*") > > Or is there another way to find out if the line starts with a hash > > mark? > > > Regards, > > Daniela > > > > > > _______________________________________________ > > freebsd-questions@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > > To unsubscribe, send any mail to > > "freebsd-questions-unsubscribe@freebsd.org"
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