lz4:tldr:f3b3e

The given command "lz4 -d ${file-lz4}" is used to decompress a file that has been compressed using the lz4 compression algorithm.

Let's break it down:

• "lz4" is the command-line tool used for working with lz4 compression.
• "-d" is an option that stands for "decompress" or "uncompress." It instructs the lz4 tool to decompress the file.
• "${file-lz4}" is a placeholder for the name or path of the lz4 compressed file that you want to decompress. It indicates that you should replace "${file-lz4}" with the actual name or path of the file you want to decompress.

So, when you execute this command by replacing "${file-lz4}" with the name or path of an lz4 compressed file, it will decompress that file and restore it to its original form.