The current command to run the check requires sha256sum which is not available on the BSDs, which require the command "sha256". We should edit the message to indicate which command to run for linux vs which command to run for BSD.
Yes good idea
There is no sha256 command in NetBSD.
You must use date -u +%jXfce|sum -a sha256|sed 's/\W//g'
Updated description, with the command to run on linux/freebsd/openbsd/netbsd :)