dd – convert and copy a file


$dd conv=ucase
god is love
GOD IS LOVE
0+2 records in
0+1 records out
12 bytes (12 B) copied, 48.6009 s, 0.0 kB/s
$


conv=CONVS
convert the file as per the comma separated symbol list
ucase -- change lower case to upper case

Reference :
Debian Manual for dd.