lpr:tldr:58292

The command "lpr ${filename}" is used to print a file named "filename" on a Linux or Unix system.

Here's how the different parts of the command work:

1. "lpr" stands for "line printer" and is a command-line utility used to send files for printing.
2. "${filename}" is a variable placeholder that represents the name of the file you want to print. You need to replace "${filename}" with the actual name of the file you want to print.

In summary, when you run this command with the appropriate file name, it will send the specified file to the default printer on your system for printing.