Using the shell’s which command will allow you to search files accessible via your environment path to determine if they already exist.

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The whereis command can be used to search a broader set of system directories independently of your environmental search path.

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Another tool which utilizes a database can be used to search a pre-compiled list of filenames on the file system.

This is the locate command.

To install you can perform an apt install plocate and initialize the database with the sudo updatedb command.

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