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You may want to save the output of gdb commands to a file. There are several commands to control gdb's logging.
set logging enabled [on|off]
set logging file
fileset logging overwrite [on|off]
overwrite
if
you want set logging enabled on
to overwrite the logfile instead.
set logging redirect [on|off]
redirect
if you want output to go only to the log file.
set logging debugredirect [on|off]
debugredirect
if you want debug output to go only to the log file.
show logging
You can also redirect the output of a gdb command to a shell command. See pipe.