| Variable
| Description
|
| $n
| nth field in current record; fields are separated by FS
|
| $0
| Entire input record
|
| ARGC
| Number of arguments on command line
|
| ARGIND
| Current file's place in command line (starting with 0)
|
| ARGV
| An array containing the command-line arguments
|
| CONVFMT
| Conversion format for numbers (default is %.6g)
|
| ENVIRON
| An associative array of environment variables
|
| ERRNO
| Description of last system error
|
| FIELDWIDTHS
| List of field widths (whitespace-separated)
|
| FILENAME
| Current filename
|
| FNR
| Like NR, but relative to the current file
|
| FS
| Field separator (default is any whitespace; null string separates into individual characters)
|
| IGNORECASE
| If true, make case-insensitive matches
|
| NF
| Number of fields in current record
|
| NR
| Number of the current record
|
| OFMT
| Output format for numbers (default is %.6g)
|
| OFS
| Output field separator (default is a blank)
|
| ORS
| Output record separator (default is a newline)
|
| RLENGTH
| Length of the string matched by match function
|
| RS
| Record separator (default is a newline)
|
| RSTART
| First position in the string matched by match function
|
| SUBSEP
| Separator character for array subscripts (default is \034) |