stdout

[c4nux0r]

Is there a way to capture all the stdout being generated? I am running a series of bash/perl scripts that all spawn off child processes, aside from piping every system call to a log file, is there anyway to capture all the stdout all of these processes output?

Thanks

[kyku]

Hi, how about grouping them together in a subshell or a script and redirecting the entire the subshell/script??

(echo Alice; echo has; echo a; echo cat) > /tmp/file.txt

[c4nux0r]

Hi, how about grouping them together in a subshell or a script and redirecting the entire the subshell/script??

(echo Alice; echo has; echo a; echo cat) > /tmp/file.txt

I don't believe that will work, as the sub processes are all kicked off at different times during the script.

[Cabhan]

A process inherits its stdout from its parent. So if I redirect the stdout of the original script, all of its children will have their stdout redirected as well.

EDIT:

An example:

alex@danu ~/test/c $ cat stdout_redirect.c 
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int main()
{
        pid_t cid;

        cid = fork();
        puts("Both processes should print this");
        if(cid == 0)
        {
                puts("Only the child should print this");
                return 0;
        }

        puts("Only the parent should print this");

        return 0;
}
alex@danu ~/test/c $ gcc -Wall stdout_redirect.c 
alex@danu ~/test/c $ ./a.out > redirected_output
alex@danu ~/test/c $ cat redirected_output 
Both processes should print this
Only the child should print this
Both processes should print this
Only the parent should print this

Note how even the child process prints to the redirected stdout

[c4nux0r]

Thanks, I thought I had tried that, but apparently not..

That worked.