Date: Fri, 15 Oct 2010 13:58:03 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Matthias Apitz <guru@unixarea.de> Cc: freebsd-questions@freebsd.org Subject: Re: gzip tries to unpack/pack 1st the filename of $GZIP Message-ID: <xeiar5frsm5w.fsf@kobe.laptop> In-Reply-To: <20101014083659.GA3150@current.Sisis.de> (Matthias Apitz's message of "Thu, 14 Oct 2010 10:36:59 %2B0200") References: <20101014083659.GA3150@current.Sisis.de>
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On Thu, 14 Oct 2010 10:36:59 +0200, Matthias Apitz <guru@unixarea.de> wrote: > Hello, > > I was facing a problem in some Makefile/shell-scripting and finally I > could nail it down: > > when you set the environment variable GZIP to something, for example to > let it point to gzip itself, it tries 1st to unpack this file: > > $ GZIP=/usr/bin/gzip export GZIP > $ $GZIP -dc source.tar.gz | wc -l > gzip: /usr/bin/gzip: not in gzip format > 645770 > > o > > $ GZIP=bla export GZIP > $ gzip -dc source.tar.gz | wc -l > gzip: can't stat: bla: No such file or directory > 645770 > > Why is this? It's not mentioned in the man page. Look at the info documentation of gzip: .---[ info gzip 'Environment' ]----------------------------------------- | 5 Environment | ************* | | The environment variable `GZIP' can hold a set of default options for | `gzip'. These options are interpreted first and can be overwritten by | explicit command line parameters. For example: | | for sh: GZIP="-8v --name"; export GZIP | for csh: setenv GZIP "-8v --name" | for MSDOS: set GZIP=-8v --name | | On VMS, the name of the environment variable is `GZIP_OPT', to avoid | a conflict with the symbol set for invocation of the program. | `-----------------------------------------------------------------------
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