The say command will speak whatever you type

$ say "hello c4cs"

Useful Options / Examples

-v can change the voice and language

-v ? will show all the voices and language they speak

-f can load a text file

-i can highlight where the computer is in the speech

--interactive=<markup> will change the preference of the highlighter

-o make an audiofile with what is said

Example commands

say -v 'Tessa' "hello c4cs"

say -v ?

say -f sample.txt

say -i "Hello there, I have become self aware"

say --interactive=blue -v 'Alex' "What a nice day"

say -o words "Creating a file called words.aiff"