compress a file

However, at higher compression levels, the time required to compress a file increases significantly.

Now, really, compressing a file is the same way, where the channel is just your hard drive.

So the idea of compressing a file statically and sending it through a channel, they're equivalent for our purposes.

It is therefore common to compress a file that is itself an archive, such as those created by the tar or cpio Unix programs.

When you right-click in Windows and say you want to compress a file, back in the DOS days there was - remember the company Stacker?