Join 2 files based on certain column

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09-07-2014

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Quote:

Originally Posted by Franklin52

The sub function replaces only the field and preserves the field separators, $1="" or $1=x doesn't.

Yes. If there is a chance that the first field could contain any characters that are special in an extended regular expression, you would need to not only change: sub($1,x) to: $1=x, but also to change the last line to:

Code:

}' OFS=\| input2.txt input1.txt

or add a BEGIN clause to set OFS.

As long as the 1st field is always just numeric characters, your code is perfectly safe.

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