fork/exec clobbers write. I need ideas why...

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Question about global environment variables & fork() exec()

Hello... And thanks in advance for any help anyone can offer me on my question! I've been doing a lot of reading to try and find my answer... But I haven't had any luck What I'm trying to understand is where a child process inherits global environment variables from? I understand the exec()...

2. UNIX for Dummies Questions & Answers

fork with exec

What is is difference between 'fork with exec' and 'fork without exec'? How both are related?

3. Programming

Newbie question on exec,fork, wait,pipe C

Hello everybody.I want to make clear that i am not going to ask from anybody to build my asignement but i have a big problem. I can't seem to find anywhere ONE good example on C about what i am trying to do:wall:.I think it is simple. All i ask is one example, even a link is fine. So, i want to...

4. Programming

Fork and then exec problem with signals

Hi All, In my program i am handling SIGHUP signal. In the handler i fork and then exec on child process same binary file which is running. Parent process will die after 10 mins. Now my child process which was exec with same binary file is not receiving SIGHUP signal. Below is the progran code:...

5. Programming

How forbid use fork() in exec() program.

Hello World! I am writing code in C++ which have to launch another application X using exec(). I would like to set some limits on it using setrlimit etc... My problem is that i don't know how to forbid using fork() and strlimit by application X. How can i do it?

6. Shell Programming and Scripting

fork and exec

I need to ssh to a remote server and run my script there. This is my script. $ssh = "ssh username@host"; $cmd = "$ssh 'cd <my dir> && < sudo Run_exe>'"; my $pid = fork; if ($pid == 0){ exec $cmd; } When I run this I get: pccons_getchar: got r == 0

7. UNIX for Dummies Questions & Answers

How to write a script by fork() in unix

Hello to UNIX Champs, Can any body help me out to write the script using fork() thru shell scripting.....i am a layman to fork(), so please give me the link or any scripts which will help me out to know the details about fork.

8. Solaris

fork and exec ftp

Hi, I need to find/implement an application that FTPs (puts) all new files in a certain directory to an external storage unit. This application should check for new files every 10 seconds (leaving the FTP connection open in between the 10 seconds). The easiest way would be if there are...

9. UNIX for Dummies Questions & Answers

FORK/EXEC technique

Hi! Can someone explain me exactly this technique? Why a process (PARENT) creates a copy of itself with FORK (CHILD)? What's the reason of this behaviour? Sorry, but I cannot understand the logic behind it. Thanks.

10. Programming

Fork and exec

Hello! I am working on a server where I should have 4 (resident)processes, one of them being "the father" of the others, so I do 3 forks. The problem that I have is that I do an accept (for sockets) in the "father" process and I want to transmit the job to one of the processes "child" with...

LEARN ABOUT CENTOS

write

WRITE(1)							   User Commands							  WRITE(1)

NAME

       write - send a message to another user

SYNOPSIS

       write user [ttyname]

DESCRIPTION

       Write allows you to communicate with other users, by copying lines from your terminal to theirs.

       When you run the write command, the user you are writing to gets a message of the form:

	      Message from yourname@yourhost on yourtty at hh:mm ...

       Any  further  lines  you  enter	will be copied to the specified user's terminal.  If the other user wants to reply, they must run write as
       well.

       When you are done, type an end-of-file or interrupt character.  The other user will see the message EOF indicating that the conversation is
       over.

       You  can  prevent people (other than the super-user) from writing to you with the mesg(1) command.  Some commands, for example nroff(1) and
       pr(1), may disallow writing automatically, so that your output isn't overwritten.

       If the user you want to write to is logged in on more than one terminal, you can specify which terminal to write to by specifying the  ter-
       minal name as the second operand to the write command.  Alternatively, you can let write select one of the terminals - it will pick the one
       with the shortest idle time.  This is so that if the user is logged in at work and also dialed up from home, the message  will  go  to  the
       right place.

       The  traditional  protocol  for	writing to someone is that the string `-o', either at the end of a line or on a line by itself, means that
       it's the other person's turn to talk.  The string `oo' means that the person believes the conversation to be over.

SEE ALSO

       mesg(1), talk(1), who(1)

HISTORY

       A write command appeared in Version 6 AT&T UNIX.

AVAILABILITY

       The write command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							    March 1995								  WRITE(1)

Programming