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Re: 'exec' produced internal code output instead of normal

From: felix
Subject: Re: 'exec' produced internal code output instead of normal
Date: Mon, 15 Mar 2021 10:49:25 +0100
User-agent: Mutt/1.10.1 (2018-07-13)

On Sat, Mar 13, 2021 at 01:05:32AM +0100, Alex fxmbsw7 Ratchev wrote:
> i have no example to write here as this was past long
Without sample, i'ts hard to represent your case!

> the story was, i was coding a file server daemon, with socat,

> and i figured to use exec why not more exact more efficient

Something like:

-- In any terminal (first)
  $ coproc socat TCP4-LISTEN:3333 STDIO
  $ while read -u $COPROC foo;do echo $foo; echo $RANDOM >&${COPROC[1]};done

-- In another terminal
  $ exec {netconn}<>/dev/tcp/localhost/3333
  $ echo >&$netconn foo ; read -u $netconn foo ; echo $foo
  $ echo >&$netconn bar ; read -u $netconn foo ; echo $foo

(while you will see in first terminal:

> but using it resulted sometimes output of code of the script in the output
> of the files
> removing exec made it work normally as supposed

Or are did you mean `EXEC` <address> of `socat`?

-- Don't run this if you don't understand what you do!  
  socat TCP4-LISTEN:3333 EXEC:/bin/bash



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