If you want to covert text to speech on your macOS Terminal you can make use of say command,
Syntax:say [-v voice] [-f file | string ...]
Example 1: Text to speech using string
% say "Hello therehow are you?"
Example 2: Text to speech using string and a female voice Alice
% say -v Alice "Hello, my name is Alice!"
Example 3: Text to speech using text from file and a female voice Alice
% say -v Alice -f my-speech-text.txt
bash-3.2$ echo "This message has been read from an external file" > my-speech-text.txt
bash-3.2$ say -v Alice -f my-speech-text.txt
bash-3.2$

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