Synopsis:
   $chmod(<file> <mode>)

Technical:
   This function provides an interface to the Unix system call chmod(2).  It
   applies the given mode to the file specified.  Refer to your Unix system
   manual for more information (usually "man 2 chmod").  The mode must be in
   numeric format.

Practical:
   This function is used to change the access permissions on a given file.
   A discussion of Unix file permissions is beyond the scope of this
   document; refer to your system's manual page for chmod(1) or chmod(2).

Returns:
   -1   error
    0   permissions changed successfully

See Also:
   umask(6)