-c Read commands from the command_string operand. Set the value of special parameter 0 (see Special Parameters ) from the value of the command_name operand and the positional parameters ($1, $2, and so on) in sequence from the remaining argument operands. No commands shall be read from the standard input. |
-i Specify that the shell is interactive; see below. An implementation may treat specifying the -i option as an error if the real user ID of the calling process does not equal the effective user ID or if the real group ID does not equal the effective group ID. |
-s Read commands from the standard input. |