Do you want to combine several options when running a command in a terminal? Just type them in right after the command itself, before the main parameters. Remember to type the hypens, too:
$ grep -r -i -l --color -a mystringtolookfor *
The nice thing is that you can collapse all the options together, as so, at least those with only one hyphen:
$ grep -rila --color yieldlove *
Note that some commands can’t be combined. Perhaps they’re not compatible, or they’re mutually exclusive.