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gawk: Built-in Variables

 
 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 minor node documents all of 'gawk''s predefined variables, most
 of which are also documented in the major nodes describing their areas
 of activity.
 

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