[Octave-bug-tracker] [bug #57830] rmdir and other file functions should not return status unless nargout > 1

[Mike Miller]

Follow-up Comment #1, bug #57830 (project octave):

How about system functions that also return a value in addition to a status
flag and error message? Should these throw an error if nargout < 2 (or nargout
< 3 in the case of 'pipe')?

* lstat
* pipe
* readdir
* readlink
* stat
* uname
* waitpid

More functions that I think fit your original criteria, first those that are
in Matlab, so we can test whether they need to be changed:

* copyfile
* fileattrib
* movefile

And these POSIX system functions similar to the others you listed:

* exec
* fcntl
* kill

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