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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--qDbXVdCdHGoSgWSk Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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 ] --qDbXVdCdHGoSgWSk Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkzImYkACgkQ9mn/Pj01uKW89QCdHcCWcv8cYANxcEp9Nx2r1xBW ABcAnRhPowm9vcm6YuUmNCIKGpKhDHTv =dNVn -----END PGP SIGNATURE----- --qDbXVdCdHGoSgWSk--
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