08-20-2008
In unix there is a special file type called a "named pipe" (look it up). So you create one of these named pipes (before running your processes). Then you take the output of your BG process and re-direct it to the named pipe. The script can then read the named pipe to pick up the BG output...
10 More Discussions You Might Find Interesting
1. Programming
Hi,
I'm trying to compile the following code:
/************** Begin <test.c> ***************/
/*
* Compiled with: gcc -Wall -o test test.c
*/
#include <stdio.h>
#include <unistd.h>
int main(void)
{
printf("I'm process %d, son of %d \n", getpid(), getppid());
printf("Hello \n");... (3 Replies)
Discussion started by: djodjo
3 Replies
2. Shell Programming and Scripting
Hi,
I have a script that's being called via a crontab which is a wrapper script that creates a log for the script that gets executed. Within the script that gets executed, it also run's subscripts. I've been able to get everything to work .. but the issue is one of the subscript that goes out... (4 Replies)
Discussion started by: primp
4 Replies
3. Programming
Hi,
I'm trying to compile the following code:
/************** Begin <test.c> ***************/
/*
* Compiled with: gcc -Wall -o test test.c
*/
#include <stdio.h>
#include <unistd.h>
int main(void)
{
printf("I'm process %d, son of %d \n", getpid(), getppid());
... (5 Replies)
Discussion started by: djodjo
5 Replies
4. Programming
Dear All:
I am trying to do something that (I thought) was relatively straightforward, but my code snippet does not seem to work.
Any suggestions?
Thank you
Sincerely yours
Misha Koshelev
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include... (0 Replies)
Discussion started by: misha680
0 Replies
5. Solaris
Hi, I put a for loop in a script to eject backup tapes from the robot. The command echo' output goes to the log file without problem, but command vmchange's output does not go to the log file although it's working fine. It still displays on the screen. I've tried '2>&1 1>$log', but nothing changed.... (5 Replies)
Discussion started by: aixlover
5 Replies
6. Shell Programming and Scripting
Below script perfectly works, giving below mail output. BUT, I want to make the script mail only if there are any D-Defined/T-Transition/B-Broken State WPARs and also to copy the output generated during monitoring to a temporary log file, which gets cleaned up every week. Need suggestions.
... (4 Replies)
Discussion started by: aix_admin_007
4 Replies
7. Programming
hi,
i have a html form which call a perl program, this perl program calls a shell script.
<html>
<head>
<title>demo</title>
</head>
<body>
<form name="frm1" action="/cgi-bin/perl_script.pl" method="post">
<input type="text" name="fname">
... (1 Reply)
Discussion started by: Little
1 Replies
8. Shell Programming and Scripting
Hi Guys,
I want to redirect the output of 3 scripts to a file and then mail the output of those three scripts.
I used below but it is not working:
OFILE=/home/home1/report1
echo "report1 details" > $OFILE
=/home/home1/1.sh > $OFILE
echo... (7 Replies)
Discussion started by: Vivekit82
7 Replies
9. Shell Programming and Scripting
Hey guys,
I have a python script that I call with this line:
python mypythonscript.py >> results.csv &The problem is that the redirection from the stdout to the file results.csv only writes 4096 kbyte blocks.
So if i kill this process with
kill the last kbytes that the script produce will... (6 Replies)
Discussion started by: Mastaer
6 Replies
10. Shell Programming and Scripting
i have simple program that generate log file 1 line every sec, i need to do grep for specific record then redirect to another file.
#!/bin/bash
for i in `seq 1 20`;
do
echo $i
sleep 1
done
./test.sh |egrep "5|10|15"
5
10
15
r
./test.sh... (2 Replies)
Discussion started by: before4
2 Replies
pipe(2) System Calls Manual pipe(2)
NAME
pipe() - create an interprocess channel
SYNOPSIS
DESCRIPTION
creates an I/O mechanism called a pipe and returns two file descriptors, fildes[0] and fildes[1]. fildes[0] is opened for reading and
fildes[1] is opened for writing.
A read-only file descriptor fildes[0] accesses the data written to fildes[1] on a first-in-first-out (FIFO) basis. For details of the I/O
behavior of pipes see read(2) and write(2).
By default, HP-UX pipes are not STREAMS-based. It is possible to generate the kernel so that all pipes created on a system are STREAMS-
based. This can only be done for HP-UX releases 10.0 and later. STREAMS-based FIFOs (created by or are not supported on HP-UX.
To generate a kernel that supports STREAMS-based pipes:
o STREAMS/UX must be installed.
o The module and the driver must be included in the file. (When STREAMS/UX is installed, and are automatically added to the system
file.)
o The tunable parameter (see streampipes(5)) must be set to 1 in the file. (This is not automatically done when STREAMS/UX is
installed.)
o The kernel must be generated and the system rebooted. Once this is done, all pipes created by will be STREAMS-based.
For more information, see
EXAMPLES
The following example uses to implement the command string
RETURN VALUE
returns one of the following values:
Successful completion.
Failure.
is set to indicate the error.
ERRORS
sets to one of the following error values if the corresponding condition is true.
or more file descriptors are currently open.
The system file table is full.
The file system lacks sufficient space to create the pipe.
Could not allocate resources for both Stream heads
(STREAMS-based pipes only).
SEE ALSO
sh(1), read(2), write(2), popen(3S), privileges(5), streampipes(5), streamio(7).
STANDARDS CONFORMANCE
pipe(2)