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Franklin52, thank you very much indeed !!!!
The first solution works very well !!
Thank you again.
kind regards.

First of all thank you for your answer.
Unfortunately it doesn't work at all, I always get the same error.
My shell is "ash".

I want to write a shell script which clones a file, example the name of the file to be cloned is "es" and I want its clone have the name "es1", "es2", "es3", and so on.
Then another program called...

hi

I wrote the following makefile, I have just one problem, when i type make clean I get the message make 'clean' is up to date and any obj file is removed from my folder, what's wrong?

Thank...

Hi,
it's a general question and if I've understood correctly the indications gave me from the administrator, this the right place where I have to post it.

I' d like to know which is the actual...

Dear administrators I want to post the following question and, honestly, I don't know in which forum to post it since its general meaning.

my question is: Where the operating system are going? ...

Thanks psiva_arul

Unfortunately I keep on receiving errors messages:
Before I continue bore you, i think it's better how I access to the FTP server without script.
The FTP server is mozzila on...

First of all thank you for your help.
Second I think I know the meaning of first line "#!/bin/sh, it should point out which interpreter use for your script.
To be more precise "#!" is a magic...

Hi guys

I'm writing my first shell script and I can't get rid of some errors.
First of all my shell is ash.
I've written the following script with the goal to log in on FTP server and...

Hi

I lost a lot of time in understanding the message "sendto Invalid argument" when I execute the following code.
This code is a simple UDP sender improved with some reliability feature.
My goal...

I hope to post in the right place, otherwise I apologize for this
I wrote a UDP sender and a UDP receiver, my goal is to transmit a file from th sender to the receiver. I'm using Ubuntu 8.04...

I want to know whicj process send the signal SIGCHLD to the parent's child.
Thank you in advance,

Hi

I need to know how a driver for a network interface card works, I want to learn the basic principles since I know that every driver has its specific implementation.
For example when we speak...

many thanks Perderabo,

Another doubt that I have is: after a child exits or is killed, in my example processB, does it send a SIGCHLD to its parent (in this case processA)?

It could be true. e.g. in C if you make a mistake using the pointer you get
this kind of error but I'd like to know what happen to the process responsible for the exception.

Thank you both

Thank you, Why is init the parent?

When the SIGCHLD is sent?
SIGCHLD is sent either a child exits spontaneously (e.g. exit(0)) or it is killed ?
thank you in advance

I hope to post in the right forum, otherwise I apologize for this.
if a MMU exception is caused by a process which tries to access to other memory segment (out of its own address space) what the...

Suppose we have the following process tree:

init-> ProcessA->processB->processC

then I kill processB

Who is the parent of the processC?
init or the processA

thank you, shamrock

I came across in the sigemptyset() posix system call and I also checked out its meaning.
Every place where I looked say:
int sigemptyset(sigset_t *set):
initializes the signal set that set...

Thank you too, ramen_noodle.
I have to learn how to manage the processes too, not only threads.
Bye

So in a nutshell only the parent can wait for the children.
Is there a reason for this ?
Imagine you have a process which want to monitor the other process, the unique way is to be the parent of...

Thank you very much Perderabo