If no changes have occurred to the binaries in this directory, the /root/.bin_chksum_output output file will be empty. To simulate a change, change the date on /bin/cat using touch and run the verification command again: # touch /bin/cat # mtree -s 3483151339707503 -p /bin > /root/.bin_chksum_output # more /root/.bin_chksum_output cat changed modification time expected Fri Sep 27 06:32:55 2013 found Mon Feb 3 10:28:43 2014