!mkfifo -m 644 fifo
stat fifo
#prw-r--r-- +\S+ +\S+ +\S+ +\d+ +\S+ +[\d :]+ fifo
stat /dev/null
#crw-rw-rw- +\S+ +\S+ +\S+ +\d+ +\S+ +[\d :]+ /dev/null
stat ""
#drwx.*

