OK, I've been thinking about the problem some more and have sort of an idea; what do you think about it:

1. define a list of all the LABELS I need and store them as variables $label1, $mylabel2 etc.;

2. with an if ... elsif loop, look for every variable $label1 and store it into a new variable; if it finds a match, this variable is defined, if not, it is undefined;

3. a number of if... statements: if variable defined, extract the data belonging to it, print the new lines, then the old data; if variable is undefined, print the new LIG instructions only.

Not sure if I have expressed this in an understandable way and if it can work, but I'll see whether I can cook up something.

In reply to Re^2: adding lines at specific addresses by pindar
in thread adding lines at specific addresses by pindar

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