Built-in Variables (The GNU Awk User’s Guide)
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7.5 Predefined Variables
Most awk
variables are available to use for your own purposes; they never change unless your program assigns values to them, and they never affect anything unless your program examines them. However, a few variables in awk
have special built-in meanings. awk
examines some of these automatically, so that they enable you to tell awk
how to do certain things. Others are set automatically by awk
, so that they carry information from the internal workings of awk
to your program.
This section documents all of gawk
’s predefined variables, most of which are also documented in the chapters describing their areas of activity.
• User-modified | Built-in variables that you change to control awk .
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• Auto-set | Built-in variables where awk gives you information.
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• ARGC and ARGV | Ways to use ARGC and ARGV .
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