Changing value of a variable inside a shell script

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# 1  
Changing value of a variable inside a shell script

I have a continous polling happening inside a shell script on AIX. This actually calls a PL/SQL block. Is there a way I can set up a variable or pass an interrupt to end the script gracefully. I cant read from the config once the job starts running. Ideally I should change value of a variable and script should detect it. Any way to do it ?

Thanks in advance.
# 2  
If you are still stuck with this, I have a suggestion.

Create a touch file with predefined name and before each iteration in the shell script, check for this file. Quit the script if the file is available.
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