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UNIX in a Nutshell: System V Edition

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Previous: 11.3 Patterns and ProceduresChapter 11
The Awk Scripting Language
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11.4 Awk System Variables

VersionVariableDescription
awkFILENAMECurrent filename.
FSField separator (default is a blank).
NFNumber of fields in current record.
NRNumber of the current record.
OFSOutput field separator (default is a blank).
ORSOutput record separator (default is a newline).
RSRecord separator (default is a newline).
$0Entire input record.
$n

nth field in current record; fields are separated by FS.

nawkARGCNumber of arguments on command line.
ARGVAn array containing the command-line arguments.
FNRLike NR, but relative to the current file.
OFMTOutput format for numbers (default is %.6g).
RSTARTFirst position in the string matched by match function.
RLENGTHLength of the string matched by match function.
SUBSEPSeparator character for array subscripts (default is \034).
gawkENVIRONAn associative array of environment variables.
IGNORECASEAn associative array of environment variables.


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