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UNIX for Dummies Questions & Answers
Struggling with mkfifo
Post 50048 by alan on Thursday 15th of April 2004 03:07:57 PM
04-15-2004
Quote:
When I type "what /usr/bin/ksh", I get
$ Revision: 82.10 $
Version 11/16/88
$ Revision: 82.10 $
Version 11/16/88
/usr/bin/ksh:
$Revision: 82.10.1.61 $
Version 11/16/88
PATCH_11_00: arith.o blok.o ctype.o defs.o edit.o echo.o expand.o fault.o io.o string.o stak.o word.o emacs.o vi.o hpux_rel.o args.o builtin.o cmd.o main.o msg.o print.o xec.o name.o macro.o error.o service.o test.o jobs.o history.o 02/09/04
Quote:
Try switching shells. Just type "sh" which will start up a posix shell.
[dev1@la]/home/dev1% sh
[dev1@la]/home/dev1% mkfifo bla
[dev1@la]/home/dev1% cat bla &
[1] 13618
[dev1@la]/home/dev1% echo "hello world" > bla
sh: bla: Cannot create the specified file.
[dev1@la]/home/dev1% ls -l bla
prw-rw-r-- 1 dev1 cadev 0 Apr 15 13:37 bla|
[dev1@la]/home/dev1%
I also tried "csh" (just in case).Same thing:
% csh
% mkfifo bla2
% cat bla2 &
[1] 14009
% echo "hello world" > bla2
bla2: Is a directory.
% ls -l bla2
prw-rw-r-- 1 dev1 cadev 0 Apr 15 13:55 bla2
%
I am stumped. Could all of this be due that my userid is forbidden to use shell commands such as these? If it is the case, wouldn't I be getting an "error" message like "You are not authorized to ... this command..."??
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LEARN ABOUT FREEBSD
mkfifo
MKFIFO(1) BSD General Commands Manual MKFIFO(1) NAME
mkfifo -- make fifos SYNOPSIS
mkfifo [-m mode] fifo_name ... DESCRIPTION
The mkfifo utility creates the fifos requested, in the order specified. The options are as follows: -m Set the file permission bits of the created fifos to the specified mode, ignoring the umask(2) of the calling process. The mode argument takes any format that can be specified to the chmod(1) command. If a symbolic mode is specified, the op symbols '+' (plus) and '-' (hyphen) are interpreted relative to an assumed initial mode of ``a=rw'' (read and write permissions for all). If the -m option is not specified, fifos are created with mode 0666 modified by the umask(2) of the calling process. The mkfifo utility requires write permission in the parent directory. EXIT STATUS
The mkfifo utility exits 0 on success, and >0 if an error occurs. SEE ALSO
mkdir(1), rm(1), mkfifo(2), mknod(2), mknod(8) STANDARDS
The mkfifo utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compliant. HISTORY
The mkfifo command appeared in 4.4BSD. BSD
January 5, 1994 BSD