My version of the GNU debugger gdb is GNU gdb (Debian 8.2.1-2+b3) 8.2.1 It is in /usr/bin/gdb /etc/gdb /usr/include/gdb /usr/share/gdb
gdb -b requires an argument. starts GDB in batch mode. gdb -b <batch_file_name>
gdb -c requires an argument. allows you to specify a command to be executed immediately after GDB starts.
gdb -d requires an argument. allows you to debug a running process gdb -d <PID>
gdb -e requires an argument. used to specify an environment variable to be set for the program being debugged.
gdb -f starts the repl. used to specify a core file for debugging. gdb -f <core_file_name>
gdb -h prints the help
gdb -i requires an argument. used to start GDB in interactive mode. gdb -i <program_name>
gdb -l requires an argument. not a common option flag.
gdb -n starts the repl. not a common option flag
gdb -p requires an argument. used to specify the PID (Process ID) of a running process that you want to attach to and debug.
gdb -q used to suppress the initial startup message when launching GDB. just says (gdb).
gdb -r starts the repl. used to restart a program that has crashed or terminated abnormally.
gdb -s requires an argument. is a shorthand for the step command. gdb -s <program_name>
gdb -t says option -t is ambiguous might be -tui or -tty
gdb -u says option -ui requires an argument
gdb -v prints the version
gdb -w starts the repl. used to set watchpoints. gdb -w <program_name> from there you can use the watch command.
gdb -x requires an argument. used to execute a GDB command script. gdb -x <script_name> <program_name>
There's only 1 upperase flag
gdb -D requires an argument. used to define preprocessor macros for the program being debugged
Help is in gdb --help or gdb -h