cvs:tldr:1b3c9

The command "cvs add ${filename}" is used in CVS (Concurrent Versions System) for adding a new file to the repository.

Here's how the command works:

1. "cvs" is the executable command for CVS.
2. "add" is the subcommand that specifies you want to add a file to the repository.
3. "${filename}" is a placeholder for the name of the file you want to add. You need to replace "${filename}" with the actual name of the file you want to add.

When you run this command, CVS will check whether the specified file exists or not. If the file exists, it will add the file to the repository, making it part of the version control system. The file will be tracked for changes, and you can perform version control operations on it.

Note: Make sure you navigate to the correct directory (the one containing the file you want to add) before running this command.