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awk divides the input for your program into records and fields.
It keeps track of the number of records that have been read so far from
the current input file. This value is stored in a predefined variable
called FNR, which is reset to zero every time a new file is started.
Another predefined variable, NR, records the total number of input
records read so far from all data files. It starts at zero, but is
never automatically reset to zero.
| • awk split records: | How standard awk splits records.
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| • gawk split records: | How gawk splits records.
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