igzip(1) on Linux
The text b128f72b57e5, as Debian 10 (Buster) shipped it.
compress or decompress files similar to gzip
Flags it lists
-
-# -
--compress -
--decompress -
--force -
--help -
--keep -
--name -
--no-name -
--quiet -
--rm -
--stdout -
--suffix -
--test -
--verbose -
--version -
-N -
-S -
-V -
-c -
-d -
-f -
-h -
-k -
-n -
-o -
-q -
-t -
-v -
-z