downshift()
Converts a string to lowercase.
Syntax
downshift(
   s STRING )
  RETURNS STRING
- s is the character string to convert to lowercase letters.
 
Usage
The downshift() function returns a string value in which all
 uppercase characters in its argument are converted to lowercase.
The character conversion depends on locale settings (the LC_CTYPE environment variable). Non-alphabetic or lowercase characters are not altered.