say

  Converts text to speech.

  - Say a phrase aloud:
    say "I like to ride my bike."

  - Read a file aloud:
    say -f filename.txt

  - Say a phrase with a custom voice and speech rate:
    say -v voice -r words_per_minute "I'm sorry Dave, I can't let you do that."

  - List the available voices:
    say -v ?

  - Create an audio file of the spoken text:
    say -o filename.aiff "Here's to the Crazy Ones."