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11.4 Built-in Variables

Version Variable Description
awk FILENAME

Current filename

  FS

Field separator (a space)

  NF

Number of fields in current record

  NR

Number of the current record

  OFMT

Output format for numbers ("%.6g" ) and for conversion to string

  OFS

Output field separator (a space)

  ORS

Output record separator (a newline)

  RS

Record separator (a newline)

  $0

Entire input record

  $ n

n th field in current record; fields are separated by FS

nawk ARGC

Number of arguments on command line

  ARGV

An array containing the command-line arguments, indexed from 0 to ARGC - 1

  CONVFMT

String conversion format for numbers ("%.6g" ) (POSIX)

  ENVIRON

An associative array of environment variables

  FNR

Like NR , but relative to the current file

  RLENGTH

Length of the string matched by match() function

  RSTART

First position in the string matched by match() function

  SUBSEP

Separator character for array subscripts ("\034" )

gawk ARGIND

Index in ARGV of current input file

  ERRNO

A string indicating the error when a redirection fails for getline or if close() fails

  FIELDWIDTHS

A space-separated list of field widths to use for splitting up the record, instead of FS

  IGNORECASE

When true, all regular expression matches, string comparisons, and calls to index() s ignore case

  RT

The text matched by RS , which can be a regular expression in gawk


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