1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
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 multi-
threading or localization, and doesn't read options from XZ_OPT envi-
ronment variable. xzdec doesn't support displaying intermediate
progress information: sending SIGINFO to xzdec does nothing, but send-
ing SIGUSR1 terminates the process instead of displaying progress
information.
OPTIONS
-d, --decompress, --uncompress
Ignored for xz(1) compatibility. xzdec supports only decompres-
sion.
-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 decom-
pressed data to standard output.
-M limit, --memory=limit
Set the memory usage limit. If this option is specified multi-
ple 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: --memory=70%
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 set-
ting limit to max. This isn't recommended. It's usually bet-
ter to use, for example, --memory=90%.
The current limit can be seen near the bottom of the output of
the --help option.
-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 sta-
tus 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
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)
Tukaani 2009-06-04 XZDEC(1)
|
