$ hello
Hello, world!
$ hello -t
hello, world
$ hello -v
GNU Hello, version 1.3
$ hello -h
This is GNU Hello, THE greeting printing program.
Usage: hello [-htvm] [--help] [--traditional] [--version] [--mail]
  -h, --help			Print a summary of the options
  -t, --traditional		Use traditional greeting format
  -v, --version			Print the version number
  -m, --mail			Print your mail