- chmod(+File, +Spec) is det
- Set the mode of the target file. Spec is one of
+Mode, -Mode or
a plain Mode, which adds new permissions, revokes permissions or
sets the exact permissions. Mode itself is an integer, a POSIX
mode name or a list of POSIX mode names. Defines names are suid,
sgid, svtx and all names defined by the regular expression
[ugo]*[rwx]*. Specifying none of "ugo" is the same as specifying
all of them. For example, to make a file executable for the owner
(user) and group, we can use:
?- chmod(myfile, +ugx).