Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: named pipes
Top Forums Shell Programming and Scripting named pipes Post 302135619 by robotronic on Tuesday 11th of September 2007 03:10:48 AM
Old 09-11-2007
A very simple example... Open a shell and type:

Code:
mknod myfifo p
echo "test" > myfifo

At this point the shell hangs, because the fifo is waiting to be read.
So, open a second shell and type:

Code:
cat myfifo

The command reads (and empties) the pipe, you will see the output "test" and the first shell will return to the prompt.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

named pipes

Hi I am having trouble with a script to export individual schemas to tape from an oracle database. Basicaly I need to export each shema through a pipe with compression and store each shema name in a file with the relevant tape marker. (4 Replies)
Discussion started by: truma1
4 Replies

2. Filesystems, Disks and Memory

PIPEs and Named PIPEs (FIFO) Buffer size

Hello! How I can increase or decrease predefined pipe buffer size? System FreeBSD 4.9 and RedHat Linux 9.0 Thanks! (1 Reply)
Discussion started by: Jus
1 Replies

3. Shell Programming and Scripting

FIFO named pipes

Hi...Can anyone please guide me on FIFO Pipes in UNIX.I have lerant things like creating fifo pipes,using them for reads and writes etc.I want to know what is the maximum amount of memory that such a pipe may have? Also can anyone guide me on where to get info on this topic from? (1 Reply)
Discussion started by: tej.buch
1 Replies

4. UNIX for Advanced & Expert Users

tee into 2 named pipes

The following code does not work (zsh, Solaris), but works without the first line (files instead of pipes) :confused: mkfifo p1 p2 echo "Hello" | tee p1 > p2 & paste p1 p2 I would high appreciate any help to fix it. (9 Replies)
Discussion started by: zzol
9 Replies

5. HP-UX

remove named pipes

Hi, Please help me on this. I am creating a named pipe in a kshell script. I am using mkfifo pipe_name command to create the pipe. I want to remove the named pipe after my work is completed. How can i do that. (8 Replies)
Discussion started by: chintapalli001
8 Replies

6. UNIX for Dummies Questions & Answers

Named Pipes

hi, i am working on a script for oracle export, m using a parameter file... i want to compress the dump file that is generated.. in my script following is the code i have written. i am not able to generata .gz file mknod /tmp/exp_tesd1_pipe p gzip -cNf... (4 Replies)
Discussion started by: saharookiedba
4 Replies

7. Shell Programming and Scripting

Temporary named pipes in Hpux Kornshell

Tried the following on Hpux 11.11, using both ksh, and dtksh $diff <(sort file1) <(sort file2) $ ksh: syntax error: `(' unexpected Strange thing is I tried the same command under RHEL5 using ksh 93 and it works fine. Does anyone know if this is possible on HPUX without the use of... (0 Replies)
Discussion started by: fire!
0 Replies

8. UNIX for Advanced & Expert Users

Named pipes using MKS Toolkit

I'm not sure whether or not this question really belongs in this forum and will accept rebuke should I have mistakenly put it in the wrong place (hopefully the rebuke will be accompanied by an answer, though) I wish to implement named pipe communication between two process using MKS Toolkit. I... (2 Replies)
Discussion started by: ArndW
2 Replies

9. Homework & Coursework Questions

C Program to search and read all named pipes in current directory

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: Write a C program to search the current directory for all pipes. 1. It will print the pipe... (2 Replies)
Discussion started by: natwickley
2 Replies

10. Shell Programming and Scripting

Dialog with an external program using named pipes

Dear community, I communicate with an external program (maxima) using named pipes. If I use a text file to capture the output (maxima > out.txt) i can see the programs answer directly after the input written into the file. But if bypass the output into a named pipe (maxima > pipe) and capture it... (1 Reply)
Discussion started by: Pustekuchen
1 Replies

LEARN ABOUT HPUX

streampipes

streampipes(5)							File Formats Manual						    streampipes(5)

NAME

       streampipes - force all pipes to be STREAMS-based

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       This tunable determines the type of pipe that is created by the system call.  If set to the default value of zero, all pipes created by are
       normal HP-UX file-system pipes.	If the value is non-zero, creates STREAMS-based pipes, and STREAMS modules can be pushed onto the  result-
       ing stream.

       If this tunable is set to a non-zero value, the and module and driver must be configured in file

   Who Is Expected to Change This Tunable?
       Any customer.

   Restrictions on Changing
       Changes to this tunable take effect at next reboot.

   When Should the Tunable Be Turned On?
       If the customer uses applications that require STREAMS-based pipes, this tunable should be turned on.

   What Are the Side Effects of Turning the Tunable On?
       STREAMS-based pipes performance may differ from normal file system pipes.

   When Should the Tunable Be Turned Off?
       If the customer does not need the STREAMS-based pipes, this tunable should be turned off.

   What Are the Side Effects of Turning the Tunable Off?
       Applications that try to push STREAMS modules onto the pipe will fail.

   What Other Tunable Should Be Changed at the Same Time as This One?
       If this tunable is set to a non-zero value, the and module and driver must be configured in the file

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						    streampipes(5)
All times are GMT -4. The time now is 12:33 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy