espeak:tldr:16465
The command "espeak -f ${filename}" is used to run the espeak program with a specified text file as input.
Here is a breakdown of the command:
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"espeak": Refers to the espeak program, which is a text-to-speech (TTS) synthesis tool. It converts text input into spoken words or audio output.
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"-f": Is an argument or option flag used to indicate that the following parameter is a file name.
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"${filename}": Is a variable that would be replaced with the actual name of the file you want to use as input. It could be something like "text.txt" or any other valid file name.
So, when you execute the command "espeak -f ${filename}" in the terminal/command prompt, the espeak program will read the contents of the specified file and convert it into speech or audio output. The resulting speech or audio will be played or outputted by the espeak program based on its configurations.