gawk: Debugging Summary
14.6 Summary
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* Programs rarely work correctly the first time. Finding bugs is
called debugging, and a program that helps you find bugs is a
debugger. 'gawk' has a built-in debugger that works very similarly
to the GNU Debugger, GDB.
* Debuggers let you step through your program one statement at a
time, examine and change variable and array values, and do a number
of other things that let you understand what your program is
actually doing (as opposed to what it is supposed to do).
* Like most debuggers, the 'gawk' debugger works in terms of stack
frames, and lets you set both breakpoints (stop at a point in the
code) and watchpoints (stop when a data value changes).
* The debugger command set is fairly complete, providing control over
breakpoints, execution, viewing and changing data, working with the
stack, getting information, and other tasks.
* If the GNU Readline library is available when 'gawk' is compiled,
it is used by the debugger to provide command-line history and
editing.
* Usually, the debugger does not not affect the program being
debugged, but occasionally it can.