utility_name [-a][-b][-c option_argument][-d|-e][-foption_argument] [operand...] operands
utility_name - should be <lowercase>, 1st character cannot be digit
[ ] - <square bracket> option = can be omitted
... - multiples allowed
[-a] - without argument
[-c option_argument] - with argument
[-d|-e] - <|> = only one or another allowed
[-foption_argument] - without <space> before argument = long option name
[operand...] - optional operand
operands - required
utility_name [OPTIONS...] OPERANDS
<uppercase> - has descriptions
[OPTIONS...] - multiple options with descriptions
OPERANDS - required with descriptions