nnn is a free and open source command line terminal file manager for Linux, macOS and BSD. It is very small buy fast and powerful terminal based file browser. you can also use this terminal file manager app as batch file renamer and disk usage analyzer. It supports plugins. Using this you can extend its features. Some of the important features are sort files by file name, modification and access time, size and extension, filter, search and Unicode support. you can also do basic functions like create, rename, duplicate files and directories in nnn terminal file manager.