On Unix systems, you have your username, say "johnsmith", and your full name, "John Smith". That's it.
Now, suppose I want to use a nickname or two - something which isn't my username, but is in a lot of use. For example, "jsmith" may be a nickname/alias for "johnsmith".
Obviously, this information can't be saved in
/etc/passwd. But - is there some idiomatic/commonly used method for indicating these nicknames?