gdb.info: Logging output

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Logging output

You may want to save the output of GDB commands to a file.  There are
several commands to control GDB's logging.
`set logging on'
     Enable logging.
`set logging off'
     Disable logging.
`set logging file FILE'
     Change the name of the current logfile.  The default logfile is
     `gdb.txt'.
`set logging overwrite [on|off]'
     By default, GDB will append to the logfile.  Set `overwrite' if
     you want `set logging on' to overwrite the logfile instead.
`set logging redirect [on|off]'
     By default, GDB output will go to both the terminal and the
     logfile.  Set `redirect' if you want output to go only to the log
     file.
`show logging'
     Show the current values of the logging settings.