The entry_point_command is a replacement for thread_command. It is used for main executables to specify the location (file offset) of main(). If -stack_size was used at link time, the stacksize field will contain the stack size needed for the main thread.
Fields
cmd: LC = .MAIN,
LC_MAIN only used in MH_EXECUTE filetypes
cmdsize: u32 = @sizeOf(entry_point_command),
sizeof(struct entry_point_command)
entryoff: u64 = 0,
file (__TEXT) offset of main()
stacksize: u64 = 0,
if not zero, initial stack size