transparently. gzip is designed as a complement to tar, not as a
replacement.
.SH "ENVIRONMENT"
-The environment variable
+The obsolescent environment variable
.B GZIP
can hold a set of default options for
.IR 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
+These options are interpreted first and can be overwritten by explicit
+command line parameters. As this can cause problems when using
+scripts, this feature is supported only for options that are
+reasonably likely to not cause too much harm, and
+.I gzip
+warns if it is used.
+This feature will be removed in a future release of
+.IR gzip .
+.PP
+You can use an alias or script instead. For example, if
+.I gzip
+is in the directory
+.B /usr/bin
+you can prepend
+.B $HOME/bin
+to your
+.B PATH
+and create an executable script
+.B $HOME/bin/gzip
+containing the following:
-On Vax/VMS, the name of the environment variable is GZIP_OPT, to
+ #! /bin/sh
+ export PATH=/usr/bin
+ exec gzip \-9 "$@"
+
+On VMS, the name of the obsolescent environment variable is GZIP_OPT, to
avoid a conflict with the symbol set for invocation of the program.
.SH "SEE ALSO"
znew(1), zcmp(1), zmore(1), zforce(1), gzexe(1), zip(1), unzip(1), compress(1)
for decompression,
.I gunzip
detects that there is extra trailing garbage after the compressed data
-and emits a warning by default. You have to use the --quiet option to
-suppress the warning. This option can be set in the
-.B GZIP
-environment variable as in:
- for sh: GZIP="-q" tar -xfz --block-compress /dev/rst0
- for csh: (setenv GZIP -q; tar -xfz --block-compr /dev/rst0
-
-In the above example, gzip is invoked implicitly by the -z option of
-GNU tar. Make sure that the same block size (-b option of tar) is used
-for reading and writing compressed data on tapes. (This example
-assumes you are using the GNU version of tar.)
+and emits a warning by default. You can use the --quiet option to
+suppress the warning.
.SH BUGS
The gzip format represents the input size modulo 2^32, so the
--list option reports incorrect uncompressed sizes and compression
compresses better than
.IR gzip .
.SH "COPYRIGHT NOTICE"
-Copyright \(co 1998-1999, 2001-2002, 2012, 2015 Free Software Foundation, Inc.
+Copyright \(co 1998-1999, 2001-2002, 2012, 2015-2016 Free Software Foundation,
+Inc.
.br
Copyright \(co 1992, 1993 Jean-loup Gailly
.PP