Man Say

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

       --progress
           Display a progress meter during synthesis.

       -v voice, --voice=voice
           Specify the voice to be used. Default is the voice selected in System Preferences. To obtain a list of voices
           installed in the system, specify '?' as the voice name.

       -r rate, --rate=rate
           Speech rate to be used, in words per minute.

       -o out.aiff, --output-file=file
           Specify the path for an audio file to be written. AIFF is the default and should be supported for most voices, but
           some voices support many more file formats.

       -n name, --network-send=name
       -n name:port, --network-send=name:port
       -n :port, --network-send=:port
       -n :, --network-send=:
           Specify a service name (default "AUNetSend") and/or IP port to be used for redirecting the speech output through
           AUNetSend.

       -a ID, --audio-device=ID
       -a name, --audio-device=name
           Specify, by ID or name prefix, an audio device to be used to play the audio. To obtain a list of audio output
           devices, specify '?' as the device name.

       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.

AUDIO FORMATS
       Starting in MacOS X 10.6, file formats other than AIFF may be specified, although not all third party synthesizers may
       initially support them. In simple cases, the file format can be inferred from the extension, although generally some of
       the options below are required for finer grained control:

       --file-format=format
           The format of the file to write (AIFF, caff, m4af, WAVE). Generally, it's easier to specify a suitable file extension
           for the output file. To obtain a list of writable file formats, specify '?' as the format name.

       --data-format=format
           The format of the audio data to be stored. Formats other than linear PCM are specified by giving their format
           identifiers (aac, alac). Linear PCM formats are specified as a sequence of:

           Endianness (optional)
               One of BE (big endian) or LE (little endian). Default is native endianness.

           Data type
               One of F (float), I (integer), or, rarely, UI (unsigned integer).

           Sample size
               One of 8, 16, 24, 32, 64.

           Most available file formats only support a subset of these sample formats.

           To obtain a list of audio data formats for a file format specified explicitly or by file name, specify '?' as the
           format name.

           The format identifier optionally can be followed by @samplerate and /hexflags for the format.

       --channels=channels
           The number of channels. This will generally be of limited use, as most speech synthesizers produce mono audio only.

       --bit-rate=rate
           The bit rate for formats like AAC. To obtain a list of valid bit rates, specify '?' as the rate. In practice, not all
           of these bit rates will be available for a given format.

       --quality=quality
           The audio converter quality level between 0 (lowest) and 127 (highest).

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

EXAMPLES
          say Hello, World
          say -v Alex -o hi -f hello_world.txt
          say -o hi.aac 'Hello, [[slnc 200]] World'
          say -o hi.m4a --data-format=alac Hello, World.
          say -o hi.caf --data-format=LEF32@8000 Hello, World

          say -v '?'
          say --file-format=?
          say --file-format=caff --data-format=?
          say -o hi.m4a --bit-rate=?

SEE ALSO
       "Speech Synthesis Programming Guide"

1.0                                                        2012-01-31                                                     SAY(1)