Shell Programming and Scripting

Hi all,

New to shell scripting, I would like to know if it is possible to pass commands to a shell, which has been launched by a parent shell.
Example:

Problem is that I cannot edit " mySecondShell.ksh". Goal is to automate software compilation (a command in a shell) and delivery (tarring, zipping etc etc).

Thanks a lot!!

I don't understand what exactly you're trying to do but some shells like ksh93 and zsh support coprocesses,
consider the following:

Code:

$ head process*
==> process1 <==
#! /usr/dt/bin/dtksh

while :; do
  sleep 3
  read && print Received your message: $REPLY
done

==> process2 <==
#! /usr/dt/bin/dtksh

./process1 |&

while :;do
  print -p message $((++i))
  read -p
  print process1 says: $REPLY
  sleep 3
done
$ ./process2
process1 says: Received your message: message 1
process1 says: Received your message: message 2
process1 says: Received your message: message 3
^C

Thanks for the answer, but it is not exactly what I am trying to do.

One can put commands in a shell script, like 'ls' or 'touch', or one can launch a program. Now I'll launch a shell in the following line:
Everything which is written below this line will be executed only AFTER having terminated the shell "mySecondShell.ksh". But how can I say what should be done in that shell "mySecondShell.ksh"?

I still don't understand,
could you describe the actions that should be done in the parent script?
Could you also post the content of mySecondShell.ksh?

:-) But that's the problem, I don't have the contents of that shell. At least I cannot modify it.

To compile my source code for a platform, I normally launch a shell from the command line, which will set several parameters etc. This shell results in some new command-line terminal, in which I simply type 'make' to compile the plug-ins for the platform.

Now I want to launch the (let's say) platform-shell from my home-brewn shell, with the line I gave you, but then of course I cannot write the commands for the platform-shell in my home-brewn shell.

It depends.
I understand that you cannot modify PlatformShell.ksh, but if you post the code it would be easier.

I think you need something like this (from what you're saying, it seems that the script invokes a new shell):

Code:

. PlatformShell.ksh<<!
make
!

Consider that . script is different than script and ./script.

Ok, then I think my mind needs a little refresh on the '.' (see also https://www.unix.com/shell-programmin...teresis-2.html ).

I've always learned to run scripts with a '.' (so that it runs in the current shell), and to run binairies (executables) without, or with ./ if the path is not set in the .bashrc or .kshrc

ps: to run a script, one should make it executable by "chmod 777"

pps: '750' also works