FreeBSD 에서 proc 디렉토리에 PID 가 없을때

# mount -t procfs proc /proc
# mount

Open /etc/fstab - file system table, enter:
# vi /etc/fstabAppend following line so that procfs get mounted automatically at boot time:
proc /proc procfs rw 0 0

http://www.cyberciti.biz/faq/howto-freebsd-mount-procfs/