最新版は以下に記載しています。
https://hana-shin.hatenablog.com/entry/2023/03/27/231218
#1 xzコマンドとは?
ファイルを圧縮するコマンドです。
#2 環境
VMware Workstation 15 Player上の仮想マシンを使いました。
仮想マシンの版数は以下のとりです。
CentOSの版数
[root@server ~]# cat /etc/redhat-release
CentOS Linux release 8.3.2011
カーネル版数
[root@server ~]# uname -r
4.18.0-240.el8.x86_64
xz版数
[root@server ~]# xz -V
xz (XZ Utils) 5.2.4
liblzma 5.2.4
本仮想マシンの仮想CPU数は8個です。
仮想CPUの個数
[root@server ~]# cat /proc/cpuinfo |grep processor
processor : 0
processor : 1
processor : 2
processor : 3
processor : 4
processor : 5
processor : 6
processor : 7
#3 オプション一覧
オプション一覧
[root@server ~]# xz --help
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/>