I remember vaguely a technique using pipes for communication between two shell processes.
Are there any tutorials available on how to setup and control a subshell?
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1Can you give more detail about what you are trying to accomplish? If you just trying to autopilot a subprocess, expect might be a better choice.frankc– frankc2010-07-21 14:14:29 +00:00Commented Jul 21, 2010 at 14:14
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4 Answers
Are you talking about named pipes?
mkfifo pipe
ls -l >pipe #type this is one shell
cat <pipe #type this is another one
No one reads if no one writes.
No one writes if no one reads.
answered Jul 21, 2010 at 12:31
Alberto Zaccagni
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Did you take a look at the Advanced Bash Scripting guide?
There's an entire chapter about - surprise surprise - subshells.
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stacker
@sm - thanks I knows this guide, but my problem is rather how to communicate between the processes
s.m.
Sorry mate, I didn't read your question carefully enough. How about this linuxjournal.com/content/using-named-pipes-fifos-bash ?
This should get you going, examples are in C, but the same technique applies to bash. Just do a search for named pipes, in google or here, alot of examples specific to bash pops up.
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I think you want coprocesses. In bash 4 there is a new builtin "coproc".
See here for examples:
