Date: Wed, 27 Oct 2010 15:28:41 -0600 From: Chad Perrin <perrin@apotheon.com> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: [OT] writing filters in sh Message-ID: <20101027212841.GA67716@guilt.hydra>
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I know that in sh you can get the contents out of files specified as
command line arguments:
while read data; do
echo $data
done <$@
I know you can also get the contents of files from pipes and redirects:
while read data; do
echo $data
done
In Perl, you can use a single construct to do both and, unlike the first
sh example, it can also take multiple filenames as arguments and
effectively concatenate their contents:
while (<>) {
print $_;
}
I'm not exactly an *expert* in sh, in part because when things start
getting "interesting" while I'm writing shell scripts I tend to just use
a more robust language like Perl. Please let me know if there's some way
to use a simple idiom like the Perl example to get the same results in
sh.
--=20
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]
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