checkpassword-pam

At least on my PCs with sh, the testing method outlined
in the manpage:

# echo -e "username\0password\0timestamp\0" \
| checkpassword-pam -s SERVICE \
--debug --stdout -- /usr/bin/id 3<&0

does not work. The reason it does not work is that \0
followed by any numbers (like a timestamp) is
interpreted by echo as an octal character.

I fixed this by replacing all instances of \0 with
\0000 in the above example.