gdb.info: Invoking GDB

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Invoking GDB

Invoke GDB by running the program `gdb'.  Once started, GDB reads
commands from the terminal until you tell it to exit.
   You can also run `gdb' with a variety of arguments and options, to
specify more of your debugging environment at the outset.
   The command-line options described here are designed to cover a
variety of situations; in some environments, some of these options may
effectively be unavailable.
   The most usual way to start GDB is with one argument, specifying an
executable program:
     gdb PROGRAM
You can also start with both an executable program and a core file
specified:
     gdb PROGRAM CORE
   You can, instead, specify a process ID as a second argument, if you
want to debug a running process:
     gdb PROGRAM 1234
would attach GDB to process `1234' (unless you also have a file named
`1234'; GDB does check for a core file first).
   Taking advantage of the second command-line argument requires a
fairly complete operating system; when you use GDB as a remote debugger
attached to a bare board, there may not be any notion of "process", and
there is often no way to get a core dump.  GDB will warn you if it is
unable to attach or to read core dumps.
   You can optionally have `gdb' pass any arguments after the
executable file to the inferior using `--args'.  This option stops
option processing.
     gdb --args gcc -O2 -c foo.c
   This will cause `gdb' to debug `gcc', and to set `gcc''s
command-line arguments (*note Arguments::) to `-O2 -c foo.c'.
   You can run `gdb' without printing the front material, which
describes GDB's non-warranty, by specifying `-silent':
     gdb -silent
You can further control how GDB starts up by using command-line
options.  GDB itself can remind you of the options available.
Type
     gdb -help
to display all available options and briefly describe their use (`gdb
-h' is a shorter equivalent).
   All options and command line arguments you give are processed in
sequential order.  The order makes a difference when the `-x' option is
used.