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You are right - the pos variable is split into the var array. Then, in all input lines ($0), gensub (a specific gawk function) replaces the characters (no matter what they are!) at the positions in...

Please use code tags for code, icode is for single-line things.

awk syntax is very compact because it has its own built in loop and shortcuts.

A simple awk program might look like:
awk...