jhawk@MIT.EDU writes:
>>Number:         712
>>Category:       bin
>>Synopsis:       sh(1) doesn't document :
>+ :
>+ This builtin has no effect. It does nothing, throws away its
>+ arguments, and returns 0 (true).
>+ .TP

That's not quite right (though the SunOS sh(1) manpage makes the same
mistake).  For example, try ": >/tmp/foo", or ": '".  The ":" builtin
parses its arguments, attempts to execute any redirection operators
which were present, and then does nothing.