/usr/bin/cps-auth is in cloudprint-service 0.14-5.
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 | #!/bin/bash
AUTHDIR=/var/lib/cloudprintd
AUTHFILE=$AUTHDIR/authfile.json
if [ ! -w $AUTHDIR ] ; then echo "Must run as root" ; exit 1 ; fi
rm -f $AUTHFILE
cloudprint -c -a $AUTHFILE
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