+ Unbind command `cmd' from function `func'.
+
+command_set_options(cmd, data)
+ Set options for command `cmd' to `data'. `data' is a string of
+ space separated words which specify the options. Each word can be
+ optionally prefixed with one of the following character:
+
+ '-': optional argument
+ '+': argument required
+ '@': optional numeric argument
+
+command_parse_options(cmd, data)
+ Parse options for command `cmd' in `data'. It returns a reference to
+ an hash table with the options and a string with the remaining part
+ of `data'. On error it returns the undefined value.