lower case code example

Example 1: perl lowercase

# create a perl string
$a = 'FOO BAR';

# convert the string to lowercase
$b = lc $a;

Example 2: bash lowercase

Just use tr command to transform lowercase letters into uppercase as:
tr a-z A-Z < file.txt	#transforms letters into uppercase in a file
echo 'HELLO' | tr A-Z a-z	#Outputs: 'hello'