Built-in Variables (The GNU Awk User’s Guide)
7.5 Predefined Variables
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 |
|• Auto-set||Built-in variables where |
|• ARGC and ARGV||Ways to use |