(gdb.info) Summary

 
 Summary of GDB
 **************
 
    The purpose of a debugger such as GDB is to allow you to see what is
 going on "inside" another program while it executes--or what another
 program was doing at the moment it crashed.
 
    GDB can do four main kinds of things (plus other things in support of
 these) to help you catch bugs in the act:
 
    * Start your program, specifying anything that might affect its
      behavior.
 
    * Make your program stop on specified conditions.
 
    * Examine what has happened, when your program has stopped.
 
    * Change things in your program, so you can experiment with
      correcting the effects of one bug and go on to learn about another.
 
    You can use GDB to debug programs written in C and C++.  For more
 information, see  Supported languages Support.  For more
 information, see  C and C++ C.
 
    Support for Modula-2 and Chill is partial.  For information on
 Modula-2, see  Modula-2 Modula-2.  For information on Chill, see
  Chill.
 
    Debugging Pascal programs which use sets, subranges, file variables,
 or nested functions does not currently work.  GDB does not support
 entering expressions, printing values, or similar features using Pascal
 syntax.
 
    GDB can be used to debug programs written in Fortran, although it
 may be necessary to refer to some variables with a trailing underscore.
(gdb.info) Summary

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