Shell Programming and Scripting

Hi
All,

I want to develope this script. any help will be appreciated.

It is possible to use two pipes and create two-way communication between two processes. (In practice, this is not done because sockets are available.) Create a program where the parent process reads the name of a language from standard input: French, Spanish, or English. The parent sends the name of the language to the child process via a pipe. The child determines the proper word for "good-bye": Au revoir (french), Adios (Spanish), or Good-bye (english) and sends this word to the parent using another pipe. The parent prints out the word.

Thanks,
Vishal

Parallel pipes are easy to do in C, not so easy in a shell script.

However if all you want is a very simple message exchange....

Code:

lookup()
{
    read LANG
    case "$LANG" in
    "ENGLISH" )  echo "goodbye" ;;
    "SPANISH" ) echo "adios" ;;
    * ) echo "TTFN";;
    esac 
}

read LANGUAGE
GOODBYE=`echo $LANGUAGE | lookup`
echo "$GOODBYE"

In Korn shell that could be done via a co-process in the way that you describe or more generically by using named pipes. However a it would be simpler to call another script as child in a subshell and capture it's output in the way that Porter has idicated.