Dialog with an external program using named pipes

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Dialog with an external program using named pipes
# 1  
Old 10-01-2013
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 using cat (cat < pipe) I get the hole output not until the external program is closed.

It would be very nice if someone of you can tell me how I can realize a dialog with the external program using pipes.

best regards and thanks in advance
# 2  
Old 10-01-2013
Did you consider stdbuf? man stdbuf:
stdbuf - Run COMMAND, with modified buffering operations for its standard streams.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. 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

2. 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

3. 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

4. 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

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. Shell Programming and Scripting

named pipes

How to have a conversation between 2 processes using named pipes? (5 Replies)
Discussion started by: kanchan_agr
5 Replies

7. 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

8. 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

9. 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

10. 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
Login or Register to Ask a Question