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Shell Programming and Scripting
checking valid values in variable
Post 302093803 by Glenn Arndt on Monday 23rd of October 2006 02:57:30 PM
10-23-2006
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LEARN ABOUT DEBIAN
xzdec
XZDEC(1) XZ Utils XZDEC(1) NAME
xzdec, lzmadec - Small .xz and .lzma decompressors SYNOPSIS
xzdec [option]... [file]... lzmadec [option]... [file]... DESCRIPTION
xzdec is a liblzma-based decompression-only tool for .xz (and only .xz) files. xzdec is intended to work as a drop-in replacement for xz(1) in the most common situations where a script has been written to use xz --decompress --stdout (and possibly a few other commonly used options) to decompress .xz files. lzmadec is identical to xzdec except that lzmadec supports .lzma files instead of .xz files. To reduce the size of the executable, xzdec doesn't support multithreading or localization, and doesn't read options from XZ_DEFAULTS and XZ_OPT environment variables. xzdec doesn't support displaying intermediate progress information: sending SIGINFO to xzdec does nothing, but sending SIGUSR1 terminates the process instead of displaying progress information. OPTIONS
-d, --decompress, --uncompress Ignored for xz(1) compatibility. xzdec supports only decompression. -k, --keep Ignored for xz(1) compatibility. xzdec never creates or removes any files. -c, --stdout, --to-stdout Ignored for xz(1) compatibility. xzdec always writes the decompressed data to standard output. -q, --quiet Specifying this once does nothing since xzdec never displays any warnings or notices. Specify this twice to suppress errors. -Q, --no-warn Ignored for xz(1) compatibility. xzdec never uses the exit status 2. -h, --help Display a help message and exit successfully. -V, --version Display the version number of xzdec and liblzma. EXIT STATUS
0 All was good. 1 An error occurred. xzdec doesn't have any warning messages like xz(1) has, thus the exit status 2 is not used by xzdec. NOTES
Use xz(1) instead of xzdec or lzmadec for normal everyday use. xzdec or lzmadec are meant only for situations where it is important to have a smaller decompressor than the full-featured xz(1). xzdec and lzmadec are not really that small. The size can be reduced further by dropping features from liblzma at compile time, but that shouldn't usually be done for executables distributed in typical non-embedded operating system distributions. If you need a truly small .xz decompressor, consider using XZ Embedded. SEE ALSO
xz(1) XZ Embedded: <http://tukaani.org/xz/embedded.html> Tukaani 2010-09-27 XZDEC(1)