say

Convert text to audible speech.
This tool uses the Speech Synthesis manager to convert input text to audible speech and either play it through the sound output device chosen in System Preferences or save it to an AIFF file.

SYNTAX
       say [-v voice] [-o out.aiff] [-f file | string ...]

OPTIONS

      string    The text to speak on the command line.
				 This can consist of multiple arguments, which are
				 considered to be separated by spaces.

       -f file	 A file to be spoken.
				 If file is - or neither this parameter nor a message
				 is specified, read from standard input.

       -v voice The voice to be used.
				 Default is the voice selected in System Preferences.

       -o out.aiff
				An AIFF file to be written.

If the input is a TTY, text is spoken line by line, and the output file, if specified, will only contain audio for the last line of the input. Otherwise, text is spoken all at once.

Returns 0 if the text was spoken successfully, otherwise non-zero.
Diagnostic messages will be printed to standard error.

"One look is worth a thousand words" - Fred R. Barnard

Related commands:

echo - Display message on screen

Equivalent BASH command: