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This way the program works, but how can i send a message from process pid1 to his parent? I must open a new queue? Any suggestions? Thanks


#include <stdlib.h>
#include <unistd.h>
#include...

Hi! I'm trying to write this program: in my intentions it should get a message and send it to a second process (pid_upost), then to a third process (pid1, pid2, pid3, depending on the choice made...

Hi! It's possible to extract from a file the first 1000 (for example) lines containing the word "home"? I can use grep to extract all the lines, but i don't know how to save only the first 1000...

Hi! I'm using

echo $string | grep "[^0-9]" -c

to test in a script if a string is a number and it seems to work. But how can i find, for example, if a string is a four figures number ?
...

hi! it's possible to test if a user exist or not? does exist something like -d for directories? i thought i could use getenv but i don't know how to use it for this purpose...

how can i verify if...

the problem is that i need it for a script; it should be something like this:

#!/bin/bash
clear
read date #mm/dd/YYYY
find -option $date

it's possible to do this kind of things?

It's possible to use "find" to search a file that was modified for example between 5/10/2004 and 7/11/2005? How can i do this? I saw there is option -mtime, but i don't understand how to use it in...

Hi! i'm trying to do a script (i'm not an expert, as you will see...:o) to search files in a directory (and its subdirectories). I'd like to have something like this:

mysearch -a arg1 -b arg2 -c...