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Re: Cygwin's vanilla sed : capabilities and limitations
- From: Igor Pechtchanski <pechtcha at cs dot nyu dot edu>
- To: fergus at bonhard dot uklinux dot net
- Cc: cygwin at cygwin dot com
- Date: Wed, 16 Jul 2003 16:43:13 -0400 (EDT)
- Subject: Re: Cygwin's vanilla sed : capabilities and limitations
- Reply-to: cygwin at cygwin dot com
On Wed, 16 Jul 2003 firstname.lastname@example.org wrote:
> This is probably a cheat question (non-central Cygwin issue) but it is about
> Cygwin's vanilla sed.
> AND it is only asked in order eventually to provide anybody interested with
> the elegant-est possible script for making a portable Cygwin CD.
Someone already mentioned Perl. Another tool is "ed". Both are pretty
heavyweight. If you want to do it in straight sed, examples are below:
> Q1. Querying info sed reveals the expression matcher to be "greedy",
> matching the longest possible string. Is there a way to make it match the
> shortest possible, so that echo aaabbbccc | sed 's/^.*b//' (altered but
> similar) grabs aaab not aaabbb?
Well, the simplest (off the top of my head) would be 's/^[^b]*b//'.
> Q2. Is there a way using the supplied sed without major enhancements to
> change "abc x def" to "def x abc": that is, to grab two distinct portions
> and swap them (using $1,$2 or \1,\2 or whatever).
Sure. 's/^\(.*\) x \(.*\)$/'.
> Sorry for asking: I know it's a sin: hope the end articulated above
> justifies the means.
Hope this helps,
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