/sys/src/cmd/primes.c primes.c
/sys/man/1/filter filter
/sys/src/cmd/upas/filterkit/deliver.c deliver.c
/sys/src/cmd/upas/filterkit/list.c list.c
/sys/src/cmd/upas/send/filter.c filter.c
/sys/src/cmd/upas/vf/vf.c vf.c