Built-in Variables
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   Most `awk' variables are available for you to use for your own
purposes; they never change except when your program assigns values to
them, and never affect anything except when your program examines them.

   A few variables have special built-in meanings.  Some of them `awk'
examines 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 chapter documents all the built-in variables of `gawk'.  Most
of them are also documented in the chapters where their areas of
activity are described.

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User-modified

Built-in variables that you change to control `awk'.

Auto-set

Built-in variables where `awk' gives you information.