Date: 21 Sep 2000 02:43:03 +0200 From: naddy@mips.inka.de (Christian Weisgerber) To: freebsd-questions@freebsd.org Subject: Re: GNU tar on FreeBSD Message-ID: <8qblin$213g$1@ganerc.mips.inka.de> References: <20000920080632.A11387@linux.rainbow> <20000920100425.A14928@linux.rainbow> <20000919233308.R367@149.211.6.64.reflexcom.com> <20000920105741.F14928@linux.rainbow>
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Igor Roboul <igorr@crosswinds.net> wrote:
> > You cannot mix the "dashless" syntax with dashed options willy-nilly.
> Ok, thank you.
> But with Linux I can. I think there is some differences between
> getopt() in glibc and getopt() in BSD libc.
FreeBSD's in-tree tar has significantly diverged from the version
currently distributed by the GNU project and typically found on
Linux distributions.
getopt() doesn't really enter the picture. Pretty much every tar
out there supports both the traditional dashless syntax and the
unix standard one with options introduced by '-'. getopt() can
only parse the latter. The traditional syntax requires separate
parsing or internal rewriting to standard syntax. Mixing both
syntaxes can give surprising results, as you noticed. I strongly
advise against it.
The traditional syntax for what you were trying to accomplish is
this:
... | tar czTf - output.tar.gz
The first argument contains all the bundled options. Arguments to
any of these options are taken in order from the subsequent arguments.
argv[0] tar
argv[1] c command: create, no argument
z option: compress, no argument
T option: input file list, will take argument 2
f option: archive file, will take argument 3
argv[2] - argument for first option to require one
argv[3] output.tar.gz
argument for second option to require one
Reordering options requires reordering of the arguments, e.g.:
... | tar cfzT output.tar.gz -
--
Christian "naddy" Weisgerber naddy@mips.inka.de
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