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(gdb.info)Kill Process

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Killing the child process
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`kill'
     Kill the child process in which your program is running under GDB.

   This command is useful if you wish to debug a core dump instead of a
running process.  GDB ignores any core dump file while your program is
running.

   On some operating systems, a program cannot be executed outside GDB
while you have breakpoints set on it inside GDB.  You can use the
`kill' command in this situation to permit running your program outside
the debugger.

   The `kill' command is also useful if you wish to recompile and
relink your program, since on many systems it is impossible to modify an
executable file while it is running in a process.  In this case, when
you next type `run', GDB notices that the file has changed, and reads
the symbol table again (while trying to preserve your current
breakpoint settings).