say:tldr:d23a9
This command is using the "say" command in Mac OS, which converts text to speech.
The "--output-file=${filename-aiff}" part is used to specify the output file name for the generated speech. The value of ${filename-aiff} is a placeholder that should be replaced with the desired name of the output file. For example, if you want the output file to be named "speech.aiff", you would replace ${filename-aiff} with "speech.aiff". The output file will be in AIFF (Audio Interchange File Format) audio file format.
The "${Here's to the Crazy Ones-}" section is the text that will be converted to speech. In this case, it is the sentence "Here's to the Crazy Ones-". The double quotes are used to enclose the text.
So, when you run this command with the specified output file name and text, it will convert the provided text to speech and save it as an AIFF file with the given name.