Current filename

Field separator (a space)

Number of fields in current record

Number of the current record

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

Output field separator (a space)

Output record separator (a newline)

Record separator (a newline)

Entire input record

nth field in current record; fields are separated by FS

Number of arguments on command line

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

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

An associative array of environment variables

Like NR, but relative to the current file

Length of the string matched by match() function

First position in the string matched by match() function

Separator character for array subscripts ("\034")

Index in ARGV of current input file

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

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

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

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