Provide help either on a specific command (if a search string is provided and an exact match is found) or on the available commands (if a search string is not provided, or if no exact match is found).
Ko‘rsatilgan buyruq uchun yordam (agar qatorni izlash uchun bo‘lsa) yoki mavjud buyruq (agar qatorni izlash uchun keltirilmasa, yoki aniq farqlar topilmagan holda)  ko‘rsatiladi.