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* NEWS: sort now uses a --compress-program option rather than

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an environment variable.
* doc/coreutils.texi (sort invocation): Document this.
* src/sort.c (usage): Likewise.
(COMPRESS_PROGRAM_OPTION): New const.
(long_options, create_temp, main): Support new option.
* tests/misc/sort-compress: Test it.
This commit is contained in:
Paul Eggert
2007-02-19 22:11:18 +01:00
committed by Jim Meyering
parent e189deb855
commit c363fcb9f0
5 changed files with 50 additions and 37 deletions
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31
doc/coreutils.texi
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@@ -3467,20 +3467,6 @@ value as the directory for temporary files instead of @file{/tmp}. The
@option{--temporary-directory} (@option{-T}) option in turn overrides
the environment variable.
@vindex GNUSORT_COMPRESSOR
To improve performance when sorting very large files, GNU sort will,
by default, try to compress temporary files with the program
@file{gzip}. The environment variable @env{GNUSORT_COMPRESSOR} can be
set to the name of another program to be used. The program specified
must compress standard input to standard output when no arguments are
given to it, and it must decompress standard input to standard output
when the @option{-d} argument is given to it. If the program exits
with nonzero status, sort will terminate with an error. To disable
compression of temporary files, set the variable to the empty string.
Whitespace and the backslash character should not appear in the
program name. They are reserved for future use.
The following options affect the ordering of output lines. They may be
specified globally or as part of a specific key field. If no key
fields are specified, global options apply to comparison of entire
@@ -3647,6 +3633,23 @@ Other options are:
@table @samp
@item --compress-program=@var{prog}
If @var{prog} is not the empty string, compress any temporary files
with the program @var{prog} rather than with the default compression
method. The default is currently @command{gzip} but this may change.
With no arguments, @var{prog} must compress standard input to standard
output, and when given the @option{-d} option it must decompress
standard input to standard output.
Terminate with an error if @var{prog} exits with nonzero status.
Whitespace and the backslash character should not appear in
@var{prog}; they are reserved for future use.
If @var{prog} is the empty string, do not compress temporary
files.
@item -k @var{pos1}[,@var{pos2}]
@itemx --key=@var{pos1}[,@var{pos2}]
@opindex -k