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calibre-server:tldr:2541f
The command "calibre-server --port ${port}" is used to start the Calibre web server on a specific port. Here's an explanation of each part of the command:
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"calibre-server": This is the command to start the Calibre web server. Calibre is a popular open-source e-book management system.
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"--port": This is an option flag used to specify the port on which the server will listen for incoming connections. By including this flag, the command expects a port number to be provided.
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"${port}": This is a placeholder for the port number that you want to use. The "${port}" is a syntax used to reference the value of the "port" variable. The actual port number should be supplied when running the command, such as "calibre-server --port 8080" to start the server on port 8080.
In summary, this command starts the Calibre web server on a specified port, with the actual port number provided as an argument.