TOLOWER(3) Library Functions Manual TOLOWER(3)
NAME
tolower, toupper - force upper or lower case
SYNOPSIS
tolower(character)
toupper(character)
DESCRIPTION
If character is an upper case letter, tolower returns the same lower
case letter, otherwise it returns the original character.
Toupper does the reverse.
SEE ALSO
ctype(3)
TOLOWER(3)