Syntax to convert Upper to lowercase:
# dd if=[file with uppercase] of=[output filename] conv=lcase
[or]
# cat [file with uppercase] | tr '[:upper:]' '[:lower:]' > output_file
Syntax to convert Lower to uppercase:
# dd if=[file with lowercase] of=[output filename] conv=ucase
[or]
# cat [file with lowercase] | tr '[:lower:]' '[:upper:]' > output_file
