Date: Thu, 11 May 2006 20:57:50 +0100 From: Daniel Bye <freebsd-questions@slightlystrange.org> To: questions@freebsd.org Subject: Re: Bourne shell scripting resources Message-ID: <20060511195750.GE5531@catflap.slightlystrange.org> In-Reply-To: <63874.209.103.215.99.1147376414.squirrel@email.polands.org> References: <63874.209.103.215.99.1147376414.squirrel@email.polands.org>
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On Thu, May 11, 2006 at 02:40:14PM -0500, Doug Poland wrote:
> Hello,
>=20
> Can someone point me to a good on-line reference for Bourne shell
> scripting? I've come across some syntax I don't understand and, since
> I don't understand it, don't know how to search the web for it.
>=20
> For example, what do these special variable characters do?
>=20
> ${UNISON_SCHED%% *} # what does %% * do?
> ${UNISON_JOB%\.*} # what does %\.* do?
The man page is a good start ;-)
Here's what is has to say about your questions:
${parameter%word}
Remove Smallest Suffix Pattern. The word is expanded to produce
a pattern. The parameter expansion then results in parameter,
with the smallest portion of the suffix matched by the pattern
deleted.
${parameter%%word}
Remove Largest Suffix Pattern. The word is expanded to produce a
pattern. The parameter expansion then results in parameter, with
the largest portion of the suffix matched by the pattern deleted.
In the second case, '\.*' is a shell file glob pattern.
You might also find this site interesting/useful:
http://www.shelldorado.com/
HTH
Dan
--=20
Daniel Bye
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