Realmente? Eu costumo usar apenas xz
- este é o topo da página man
:
XZ(1) XZ Utils XZ(1)
NAME
xz, unxz, xzcat, lzma, unlzma, lzcat - Compress or decompress .xz and .lzma files
SYNOPSIS
xz [option]... [file]...
unxz is equivalent to xz --decompress.
xzcat is equivalent to xz --decompress --stdout.
lzma is equivalent to xz --format=lzma.
unlzma is equivalent to xz --format=lzma --decompress.
lzcat is equivalent to xz --format=lzma --decompress --stdout.
When writing scripts that need to decompress files, it is recommended to always use the name xz with appropriate arguments (xz -d or
xz -dc) instead of the names unxz and xzcat.
Então xz -d foo.xz
faz exatamente o que você precisa.