Editing FNR

The *FNR* informative [[special variable]] is used to track the number of [[record]]s that have so far been read from the current [[input]] file. It is incremented each time a new [[record]] is obtained from [[input]] and is reset to zero, when a new file is started. === Adding line numbers to a file === The FNR [[special variable]] can be wielded to give a simple way of adding line numbers to a file using [[awk]]: awk '{print FNR,$0 }' filename

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This change is a minor edit.

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