The Midnight commander

The midnight commander (mc) is a powerful text based file manager. It is a directory-browsing tool and allows all the basic file operations. It can be used to view the contents of archived files, browse the ftp repository of a remote server and undelete files in the older file systems, and has a built-in text and hex viewer.

It even allows you to use the command line within it. It can be started by typing mc at the prompt.