uc
See the current Perl documentation for uc.
Here is our local, out-dated (pre-5.6) version:
uc - return upper-case version of a string
uc EXPR
uc
Returns an uppercased version of
EXPR. This is the internal function implementing the \U
escape in double-quoted strings. Respects current
LC_CTYPE locale if use locale
in force. See the perllocale manpage.
If
EXPR is omitted, uses $_
.