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Most @command{awk} variables are available for you 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 @command{awk} have special built-in meanings. @command{awk} examines some of these automatically, so that they enable you to tell @command{awk} how to do certain things. Others are set automatically by @command{awk}, so that they carry information from the internal workings of @command{awk} to your program.
This minor node documents all the built-in variables of @command{gawk}, most of which are also documented in the chapters describing their areas of activity.
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