If you use the Korn shell you could use the so-called "Coprocess facility". Notice, though, that only the Korn shell supports these, the solution will not be portable to any other Bourne-shell-descendant (and most probably not even to the many ksh-clones which are only "mostly compatible"). Basically you are starting an asynchronously running background job which communicates with the main job via (bidirectional) pipes.
You start the coprocess with
and then process the incoming/outgoing messages with read -p and print -p. Per default IOD 4 and 5 are used for this but can be redirected via exec if you have several coprocesses at the same time.
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:... (2 Replies)
Hi,
i want to write a script that executes a program (exec?) .
this program then requires a filename as input.
how do i give it this input in the script so the program will be complete run and close by the script.
e.g.
exec prog.exe
program then asks for filename
"enter filename:"... (1 Reply)
Hi,
I would like to write a program to receive the GPS data and then send the data via network to other program.
All of the program is not write yet(include host and sender)
All of the server OS is unix or linux
Could you mind to give me some idea to do this?
Thanks so much!
Ken
... (2 Replies)
Hello,
I recently upgraded our server from Solaris 8 to 9. The sendmail is unabled to pipe the email to a perl script. I can send and received email to local and external mail, but the script did not get the email. There is no error in the log and I could not find any thing on the web.
Here... (0 Replies)
Hello guys,
my professor give me 2 days to study and make a program usign pipe, fork in c
i need to do a program
read a arq.txt
the father process read the file and the child print !
like this
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
int main (){
... (1 Reply)
Hello guys,
my professor give me 2 days to study and make a program usign pipe, fork in c
i need to do a program
read a arq.txt
the father process read the file and the child print !
2. Relevant commands, code, scripts, algorithms:
like this
Code:
#include <stdio.h>... (1 Reply)
Hi,
I am trying to sftp a large file(appx. 2 GB size) from solaris 10 to a Linux server. While sftping(with no options), connection is terminated after some time with broken pipe error. sftp with option -R1 or -B1500 is successful.
Linux server ssh Version: OpenSSH_3.9p1, OpenSSL 0.9.7a... (3 Replies)
Hi all,
I have a text data file. My aim here is to find line called *FIELD* AV for every record and print lines after that till *FIELD* RF. But here I want first 3 to four lines for very record as well. FIELD AV is some where in between for very record. SO I am not sure how to retrieve lines in... (2 Replies)
For example, I have a file called number.txt.
x y
1 1
2 4
3 9
4 6
5 5
6 6
7 9
8 4
9 1
10 0
...
And I want to print out the value of x and y, if y%4==0 and the next value of y%4==0. Thus, the sample output is:
1 1 *because the previous x before 2 is 1
2 4 *because 4%4 == 0
7 9... (2 Replies)
Hi Guys,
I am getting some strange error in /var/adm/messages in my Solaris 10 box with Veritas Cluster and EMC storage.
bash-3.00$ cat /var/adm/messages | egrep -v "lw8|snmp|sshd|xntpd|kern.info|LOGIN|link|service|started|finished|repeated|SS7 Log-daemon|success"
Dec 18 09:58:35 GAMMa2... (1 Reply)
Discussion started by: vivek.goel.piet
1 Replies
LEARN ABOUT PLAN9
shell
shell(1F) FMLI Commands shell(1F)NAME
shell - run a command using shell
SYNOPSIS
shell command [command] ...
DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise
/usr/bin/sh).
EXAMPLES
Example 1: A sample output of shell command.
Since the Form and Menu Language does not directly support background processing, the shell function can be used instead.
`shell "build prog > /dev/null &"`
If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe-
cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to
save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing.
shell can also be used to execute a command that has the same name as an FMLI built-in function.
NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments
will not be expanded by the shell because "local" means "local to the current process."
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO sh(1), attributes(5)SunOS 5.10 5 Jul 1990 shell(1F)