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Bring prompt from a different process

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# 1  
Old 06-15-2015
Bring prompt from a different process
Hi,

while running a program one of the command is creating a sub-shell which requires user inputs. Is there a way to bring the input prompt to a parallel session or an alternate way to input the values? the outer program doesn't allow to accept the parameter value for the command run in the sub shell.

Thanks!!
# 2  
Old 06-15-2015
There is no reason why a process running in a subshell can't read user input. But, a process running in the background can't. Only a foreground process can read from the controlling terminal for that process group.
# 3  
Old 06-15-2015
Hi Don,

It is indeed a foreground process which is being created be a program as another user which I need to bring it on to a prompt to be able to input the values. is there a way to bring the input prompt from a process that is already waiting for a process from one session to another?

Thanks,
Waseem
# 4  
Old 06-15-2015
I don't understand what you mean by bringing a process on to a prompt.

Maybe a concrete example showing what processes are running, what user IDs and group IDs were used when invoking those utilities, what prompts those processes are writing, and what input they are trying to read would help.
# 5  
Old 06-15-2015
sure. I am running a setup program as root. This starts a web GUI to get user inputs. Using the input user name from the webpage it starts a command as su.


Code:
1. setup command holds the screen and starts web interface(root) 
>> 2. In Web interface it asks for user name input
>> 3. Using user name input provided in the web page a new sh script(generated on fly) is executed which runs java command
>>4 this java command requires input from humans and it holds the processes and hangs forever.

I hope this provides the clarification!!
# 6  
Old 06-15-2015
I'm lost as well.

If you are running a script in a terminal emulator like xterm or lxterminal, you could open another terminal running your second program in parallel:
Code:
su -c "lxterminal -e ./yourscript"  newuser

---------- Post updated at 12:28 ---------- Previous update was at 12:24 ----------

Be aware that there are no automatically created data/information exchange channels between the processes. You'd need to use fifos or files.
# 7  
Old 06-15-2015
Ok, let me try to clarify again. Sorry for the confusion.

Here is a sample code

Code:
./wrapper.sh

within wrapper.sh
Code:
runuser -l username -c read -p "input a value" input

In the above example wrapper.sh is being triggered as root which in turn is running read command as another user waiting for input. can I have a parallel session logged in as "username" and get to input?
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