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UNIX Scripting FAQ

ksh Inter-process comm's

Simple example of TWO-WAY pipe by mi294r3
Posted: 18 Dec 02

    This is an very simple example of a ksh script that starts
a child process with a two way pipe.

    The Parent process displays its process ID $$
        starts the child process with a two-way pipe |&

    displays the process ID of the child $!

    reads from the two-way pipe read -p
    and asigns what it read to CHILD_MSG


    child process just echo's its own process ID $$
    for the child process stdin and stdout a forced to the pipe.


    parent process displays value of CHILD_MSG which was read from pipe

parent script
   echo "My Process ID is $$"                            
   child |&                                             
   echo "The childs process ID is $!"                    
   read -p CHILD_MSG                                     
   echo "The child states his process ID is ${CHILD_MSG}"

child script
  echo $$  


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