/sbin/casper-getty is in casper 1.315.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14  | #! /bin/sh
autologin=1
for opt in "$@" ; do
        if [ "$opt" = "-l" -o "$opt" = "-n" ] ; then
                autologin=0
        fi
done
if [ "$autologin" = "1" ] ; then
         exec /sbin/getty -n -l /sbin/casper-login $*
else
         exec /sbin/getty $*
fi
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