Sets a break point on main in stripped and unstripped x86 linux binaries
you can run gdb ./path_to_your_binary -x find_main.gdb
or add source /path_to_script/find_main.gdb to the beginning of your gdb script
or run line by line in a gdb session (make sure the binary is loaded in)
You probably just need to change the break *$rdi to whatever register represents the first function parameter in your arch