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awk Built-in Variables

FILENAME

name of current input file

FS

field separator character (default blank & tab)

NF

number of fields in input record

NR

number of input record

OFMT

output format for numbers (default %g; see printf(3))

OFS

output field separator string (default blank)

ORS

output record separator string (default newline)

RS

input record separator character (default newline)