* archival/gzip.c (ifname, ofname): Delete.
  (gzip_main): Handle multiple files.
* include/usage.h (gzip_trivial_usage): Allow multiple FILEs.
  (gzip_full_usage): Ditto.
* testsuite/gzip/gzip-accepts-multiple-files: New.
* testsuite/gzip/gzip-removes-original-file: New.
4 files changed