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I think your file must have some control characters in it that are not visible and also not copied into your example text.
That would explain why the code works when I use it on the examples given....

Which shell and operating system are you using? I tested with bash and it worked perfectly on the sample data you provided in a couple of earlier posts. Perhaps your /bin/sh isn't up to the task....

Try this


awk '/N=/ {
val=substr($0,3);for(i=0;i<val;i++){
pre="";if(i>0){pre="+"};getline;split($0, arr, "=");str=str pre arr[2];}
getline;split($0, arr, "=");str=str"="arr[2];print...