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gawk: Records

 4.1 How Input Is Split into Records
 '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.


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