MKFIFO(1) General Commands Manual MKFIFO(1)
mkfifo – make fifos
mkfifo [-m mode] fifo_name ...
mkfifo creates the fifos requested, in the order specified. By default,
the resulting fifos have mode 0666 (rw-rw-rw-), limited by the current
The options are as follows:
-m Set the file permission bits of newly-created fifos to mode,
without respect to the current umask.
The mode is specified as in chmod(1). In symbolic mode strings,
the “+” and “-” operators are interpreted relative to an assumed
initial mode of “a=rw”
mkfifo requires write permission in the parent directory.
mkfifo exits with 0 if successful, and with >0 if an error occurred.
In legacy mode, the fifo's file permission bits are always limited by the
For more information about legacy mode, see compat(5).
mkdir(1), rm(1), umask(1), mkfifo(2), umask(2), compat(5), mknod(8)
The mkfifo utility is expected to be IEEE Std 1003.2-1992 (“POSIX.2”)
mkfifo command appeared in 4.4BSD.
BSD 4.4 January 5, 1994 BSD 4.4