Bash Scripting Variable Scope Using Piped While Loop -

Bash Scripting Variable Scope Using Piped While Loop

I've been struggling with this for awhile, wondering why all of my variables are null.  I just realized the variables disappear after leaving this while loop.

Note that I'm piping to the while loop which makes a subshell I believe which is the cause of the issue:

 

echo "$accounts"|while read thisline; do
   somevariable="some value"
   (( ++counter ))
done

At all costs you need to avoid the style above, use a for loop or whatever it takes BUT DO NOT pipe anything in or the variables you get from the loop will be NULL


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