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Top Forums Shell Programming and Scripting How to send data to previous program (pipe)? Post 303012656 by bakunin on Wednesday 7th of February 2018 10:42:33 AM
Old 02-07-2018
If you use the Korn shell you could use the so-called "Coprocess facility". Notice, though, that only the Korn shell supports these, the solution will not be portable to any other Bourne-shell-descendant (and most probably not even to the many ksh-clones which are only "mostly compatible"). Basically you are starting an asynchronously running background job which communicates with the main job via (bidirectional) pipes.

You start the coprocess with

Code:
command |&

and then process the incoming/outgoing messages with read -p and print -p. Per default IOD 4 and 5 are used for this but can be redirected via exec if you have several coprocesses at the same time.

I hope this helps.

bakunin
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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