Re-post from
<http://unix.stackexchange.com/questions/36752/why-are-parameters-to-bashs-command-and-type-optional>:
[T]hese commands print nothing and return exit code 0 if no parameters are
provided. But [...] `help command` and `help type` both state that at least one
parameter is mandatory. Is this a bug, a feature, or did I misunderstand
something?
$ bash --version
GNU bash, version 4.2.10(1)-release (x86_64-pc-linux-gnu)
$ type -a command
command is a shell builtin
$ type -a type
type is a shell builtin
$ help -s command
command: command [-pVv] command [arg ...]
victor@victor:/home/victor/taclom/rails (master *$)
$ help -s type
type: type [-afptP] name [name ...]
$ command
$ echo $?
0
$ type
$ echo $?
0
