trashcan.txt is used to restrict user names.
gfiles/trashcan.txt is used to disallow names from login.
If a name or pattern of a name is entered, the session will immediately end.
The format of the file is plan text, one pattern per line. A
* may be
used at the beginning or the end of a string as a wildcard, otherwise lines
entered are counted as an exact case-insensitive match.