How to specify level of compression when using tar

https://superuser.com/questions/305128/how-to-specify-level-of-compression-when-using-tar-zcvf

$ tar cv /path/to/directory | gzip --best > file.tar.gz

When calling tar, option f states that the output is a file. Setting it to - (stdout) makes tar
write its output to stdout which is the default behavior without both f and -.

And as stated by the gzip man page, if no files are specified gzip will compress from standard input.
There is no need for - in the gzip call.

Option --best (equivalent to -9) sets the highest compression level.

# apt-get install 7zip
# dpkg -L 7zip
/usr/bin/7zz ...

$ 7zz
Usage: 7zz <command> [<switches>...] <archive_name> [<file_names>...] [@listfile]

<Commands>
  a : Add files to archive
  b : Benchmark
  l : List contents of archive
  u : Update files to archive
  x : eXtract files with full paths

-bt : show execution time statistics
-mmt[N] : set number of CPU threads
-mx[N] : set compression level: -mx1 (fastest) ... -mx9 (ultra)
-o{Directory} : set Output directory
-p{Password} : set Password

$ 7zz a -bt -mmt8 --mx9 t.7z lanczos/
$ 7zz l t.7z