XZDEC(1) XZ Utils XZDEC(1)
xzdec, lzmadec - Small .xz and .lzma decompressors
xzdec [option]... [file]...
lzmadec [option]... [file]...
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 localiza-
tion, and doesn't read options from XZ_OPT environment variable. 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.
-d, --decompress, --uncompress
Ignored for xz(1) compatibility. xzdec supports only decompression.
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
-M limit, --memory=limit
Set the memory usage limit. If this option is specified multiple times, the last
one takes effect. The limit can be specified in multiple ways:
o The limit can be an absolute value in bytes. Using an integer suffix like MiB
can be useful. Example: --memory=80MiB
o The limit can be specified as a percentage of physical RAM. Example: --mem-
o The limit can be reset back to its default value (currently 40 % of physical
RAM) by setting it to 0.
o The memory usage limiting can be effectively disabled by setting limit to max.
This isn't recommended. It's usually better to use, for example, --memory=90%.
The current limit can be seen near the bottom of the output of the --help option.
Specifying this once does nothing since xzdec never displays any warnings or
notices. Specify this twice to suppress errors.
Ignored for xz(1) compatibility. xzdec never uses the exit status 2.
Display a help message and exit successfully.
Display the version number of xzdec and liblzma.
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
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.
Tukaani 2009-06-04 XZDEC(1)