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UNIX in a Nutshell: System V Edition

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The Awk Scripting Language
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11.4 Awk System Variables

Version Variable Description
awk FILENAME Current filename.
FS Field separator (default is a blank).
NF Number of fields in current record.
NR Number of the current record.
OFS Output field separator (default is a blank).
ORS Output record separator (default is a newline).
RS Record separator (default is 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.
FNR Like NR, but relative to the current file.
OFMT Output format for numbers (default is %.6g).
RSTART First position in the string matched by match function.
RLENGTH Length of the string matched by match function.
SUBSEP Separator character for array subscripts (default is \034).
gawk ENVIRON An associative array of environment variables.
IGNORECASE An associative array of environment variables.


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