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I just thought that I should say that, with the above advice, the script DID work (I believe that Glenn Arndt's observation - that I should use ${}$ syntax not {$$} syntax - was where I was going...

In response to Glenn Arndt's response, am I correct in stating that, if I declare a value of num1 and num2 outside of the script, I will find that these values are not automatically accessible from...

In order to make things easier to follow (even thought I'm only dealing with simple scripts), the following are the scripts that are related to each other :

SCRIPT 1 :
#!/bin/bash
num3=`expr...

I have created the following script to add 2 numbers together :
lazyadd2 script :
#!/bin/bash
#I have added the she-bang script above as I felt that this would be a good idea.
#The script...