Awk Tips & Tricks: print a "," at the end of the line EXCEPT the last one!

Small AWK idiomatic tip.

If you want to add a char at the end of each line.EXCEPT the last one.
for instance you are generating an array.

awk NR>1 {printf(",\n");} {printf($0);}

TLDR;
The NR stands for number record, the line it is processing usually.
the printf statement prints out without the ORS( output record separator) usually newline (\n) char.
END;

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