more:tldr:e1fc5

The command "more ${filename}" is used to display the contents of a file on the command line interface.

Here's how it works:

1. The "${filename}" part denotes a placeholder where you should replace it with the actual name of the file you want to view.

2. When you execute the command, the "more" command is invoked, and it takes the file specified as input.

3. The "more" command then displays the file's contents, page by page, allowing you to scroll through it. You can press the Enter key to view one line at a time or the Spacebar key to view one page at a time.

4. Typically, when you reach the end of the file, the "more" command will exit, and you'll return to the command prompt.

This command is commonly used in Unix-like systems, such as Linux and macOS, for viewing text files without opening a separate file viewer or editor.