/usr/bin/batch is in at 3.1.20-3.1ubuntu2.
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 | #! /bin/sh -e
if [ "$#" -gt 0 ]; then
echo batch accepts no parameters
exit 1
fi
prefix=/usr
exec_prefix=${prefix}
exec ${exec_prefix}/bin/at -qb now
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