/usr/lib/postgresql/9.4/bin/oid2name
/usr/lib/postgresql/9.4/bin/pg_archivecleanup
/usr/lib/postgresql/9.4/bin/pgbench
/usr/lib/postgresql/9.4/bin/pg_standby
/usr/lib/postgresql/9.4/bin/pg_test_fsync
/usr/lib/postgresql/9.4/bin/pg_test_timing
/usr/lib/postgresql/9.4/bin/vacuumlo
You may install this package on Debian with
apt-get
install postgresql-contrib-9.4