[root@localhost /]# file donkey.gz
donkey.gz: gzip compressed data, deflated, original filename, last modified: Sat Apr 13 15:09:03 2002, os: Unix
[root@localhost /]# gzip -f donkey.gz
gzip: donkey.gz already has .gz suffix -- unchanged
[root@localhost /]#
  이거 어떻해야됩니까?-_-;