commandline session
$echo a > hex.txt $hexdump hex.txt 0000000 0a61 0000002 $ $echo b > hex.txt $hexdump hex.txt 0000000 0a62 0000002 $echo ab > hex.txt $ $hexdump hex.txt 0000000 6261 000a 0000003 $echo > hex.txt $hexdump hex.txt 0000000 000a 0000001 $echo abc > hex.txt $hexdump hex.txt 0000000 6261 0a63 0000004 $