$ dd if=/dev/urandom bs=1m count=1 > test.random 2>/dev/null
$ lz4 -9 < test.random > test.compressed
$ ls -l test.{random,compressed}
-rw-r--r--  1 conrad  conrad  1048595 Mar 26 16:11 test.compressed
-rw-r--r--  1 conrad  conrad  1048576 Mar 26 16:11 test.random