June 2003
Beginner to intermediate
944 pages
43h 1m
English
Content preview from Linux in a Nutshell, Fourth Edition
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gawk System Variables
|
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 |
|
LINT |
If true, run as if -W lint had been specified on the command line; if value is FATAL, generate fatal errors |
|
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) |
|
RT |
The input text matching the record separator (RS) for the current record |
|
RSTART |
First position in the string matched by match function |
|
SUBSEP |
Separator character for array subscripts (default is \034) |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.