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Old 05-08-2008, 07:11 PM   #1
jakeo25
LQ Newbie
 
Registered: Jan 2008
Location: Boulder, CO
Distribution: Ubuntu Gusty / Fiesty
Posts: 7

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Getting asynchronous user input in BASH


Hello

I have a BASH script running and would like to stop, without using Ctrl-C (this shuts down the entire script, which is not desired). So I need a clean exit from a running function. The bash built-in 'read' only accepts user input when prompted, and has a minimum of 1 second wait. It is not as 'clean' as I'd like ...(just hold down a key until the function execution catches up to the read ).

So here is what I would like: if the user presses a key at ANY time while a particular function is running, this key stroke would be caught and 'remembered'. The function would periodically check a variable or external event inside this loop, then do a clean exit from the function.

Any key should work, but a specific escape sequence like Ctrl-<something> would be fine.

Thanks in advance.

sed s|jake|Superjake|g
 
Old 05-08-2008, 07:22 PM   #2
jailbait
LQ Guru
 
Registered: Feb 2003
Location: Blue Ridge Mountain
Distribution: Linux Mint 17, Debian 8
Posts: 7,865

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Depending on how the logic of your program handles the asynchronous input you might be able to do what you want with the trap command.

http://linux.die.net/man/1/trap

Another approach would be to make the asynchronous read a separate thread which signals the main thread when input has been received.

---------------------
Steve Stites
 
  


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