XZ命令
Usage: xz [OPTION]... [FILE]...
Compress or decompress FILEs in the .xz format.
Mandatory arguments to long options are mandatory for short options too.
-z, --compress force compression
-d, --decompress force decompression
-t, --test test compressed file integrity
-l, --list list information about files
-k, --keep keep (don't delete) input files
-f, --force force overwrite of output file and (de)compress links
-c, --stdout write to standard output and don't delete input files
-0 .. -9 compression preset; 0-2 fast compression, 3-5 good
compression, 6-9 excellent compression; default is 6
-e, --extreme use more CPU time when encoding to increase compression
ratio without increasing memory usage of the decoder
-q, --quiet suppress warnings; specify twice to suppress errors too
-v, --verbose be verbose; specify twice for even more verbose
-h, --help display this short help
-H, --long-help display the long help (lists also the advanced options)
-V, --version display the version number
-z 压缩
-d 解压
-k 保留源文件
-0 -9 压缩率参数，不设置的话默认是6
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