lzip:tldr:3983c

The command "lzip ${filename}" is using the utility program called "lzip" to compress a file with the name stored in the variable "filename."

Here is a breakdown of each part of the command:

• "lzip" is the name of the utility program that is used for file compression.
• "${filename}" is a variable that holds the name of the file that you want to compress. It is enclosed in curly braces and prefixed with a dollar sign to indicate that it should be expanded to the value stored in the variable.
• When you execute this command, the "lzip" program will be invoked and it will compress the file specified by the value of the "filename" variable. The compressed file will typically have the same name as the original file, but with an additional extension indicating the compression format used by "lzip" (e.g., ".lz" or ".lzma").

In summary, this command compresses a file using the "lzip" program, and the specific file to be compressed is determined by the value stored in the "filename" variable.