fmt:tldr:53655

The command "fmt ${filename}" is used to format the content of a file in a specific way.

Here's how it works:

1. "${filename}" is a placeholder that represents the name of the file you want to format. You would replace "${filename}" with the actual name of the file you want to format.

2. The command is usually run in a command-line interface or terminal.

3. When you run the command, the "fmt" program reads the content of the specified file and formats it according to certain rules.

4. The formatting rules usually involve adjusting the line length, word wrapping, indentation, and other aspects to make the text more readable.

5. After formatting, the "fmt" program may overwrite the original file with the newly formatted version. If you want to keep the original file intact, it's a good practice to create a backup before running this command.

Overall, "fmt ${filename}" is a command used to format the content of a file to improve its readability and presentation.