rar:tldr:72a70

The given command is used to create a RAR archive file with a specific size limit and can include both files and directories.

Let's break down the different components of the command:

rar: This is the command used to interact with the RAR compression utility.

a: This argument specifies that we want to create a new archive.

-v${50M}: This argument sets the maximum size of each volume in the archive. The ${50M} part means that the size is 50 megabytes (M). This option is used to split the archive into multiple smaller parts, which can be helpful when dealing with large files.

-R: This argument tells RAR to include the contents of subdirectories recursively. It means that if the filename_or_directory provided is a directory, it will add all files and subdirectories within it.

${path-to-archive_name-rar}: This is the path and name of the archive file you want to create, followed by the .rar extension.

${filename_or_directory}: This represents the file or directory you want to include in the archive. It can be a single file or a directory with multiple files and subdirectories.

To summarize, the command creates a RAR archive file with a specific volume size limit (-v${50M}) and includes all the files and directories (${filename_or_directory}) inside the archive.