高压缩率工具xz

前言：

　　xz这个压缩工具可能很多人都很陌生，xz是绝大数linux默认就带的一个压缩工具。在压缩率上甚至比7z还要小，在需要将文件极致压缩的情况下，是一个给力的工具：

Usage: xz [OPTION]... [FILE]...
Compress or decompress FILEs in the .xz format.

  -z, --compress      force compression
  -d, --decompress, --uncompress
                      force decompression
  -t, --test          test compressed file integrity
  -l, --list          list information about .xz files
  -k, --keep          keep (don't delete) input files
  -f, --force         force overwrite of output file and (de)compress links
  -c, --stdout, --to-stdout
                      write to standard output and don't delete input files
  -0 ... -9           compression preset; default is 6; take compressor *and*
                      decompressor memory usage into account before using 7-9!
  -e, --extreme       try to improve compression ratio by using more CPU time;
                      does not affect decompressor memory requirements
  -T, --threads=NUM   use at most NUM threads; the default is 1; set to 0
                      to use as many threads as there are processor cores
  -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 and exit
  -H, --long-help     display the long help (lists also the advanced options)
  -V, --version       display the version number and exit

With no FILE, or when FILE is -, read standard input.

Report bugs to <lasse.collin@tukaani.org> (in English or Finnish).
XZ Utils home page: <http://tukaani.org/xz/>

上面就是xz命令的用法，简单的来说呢，xz命令考虑的是极致的压缩率，一般情况下tar -czvf tar-zxvf都可以解决问题了，值得一提的是，xz命令不支持对文件夹压缩，如果需要压缩文件夹，则可以先将其转为tar包，而后再xz

xz -kz9 test.tar    不删除原文件的压缩（xz -z9则为删除原文件）

xz -kd    不删除原文件的解压（xz -d则为删除原文件的解压）

pixz命令是需要自己安装的，可以使用cpu多线程的来进行压缩，大大减少xz命令的压缩时间。使用链接https://www.kutu66.com/GitHub/article_56016，github地址http://www.github.com/vasi/pixz