Ranger is a text based file manager that works inside of a terminal emulator.
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Pro Minimalist and efficient
There is no need for icons of files if headings are used. Previews of text documents and a simple design creates and efficient workflow.
Pro Can be used in terminal
Which makes for a good choice of file explorer for those that use machines without a GUI.
Pro Extensible, scriptable
Ranger allows the use of various scripts for calling on individual or multiple files, for file previews, or for other operations.
This allows for in-terminal full colour previews of images and videos.
You can even call external scripts or chain shell commands from the primary interface.
Pro Vim-like bindings
Ranger has Vim-like keybindings which help a lot in increasing efficiency and speed up the workflow.
Pro Bookmark system
Makes it easy to jump to any specific folder locations you work with.
Pro Easily used with SSH
Con Difficult learning curve for people who are not used to Vim
Since it uses many of vim's keybindings, it may be hard for someone who does not use vim or does not know how to use vim to learn how to work with this file manager.
Con A great idea but not GUI friendly
May be difficult to get past the fact that it asked for commands dd and cc and the likes to cut and or paste. Arch-Linux normally prides itself on not over-complicating things. Too bad ... a great idea with the 3 Smart Columns, but why would anyone prefer to need to learn 30 commands in order to cut and paste or copy a file or folder, or to see/change permissions.
Con No built-in ability to navigate FTP/SSH
Most other GUI-based file managers provide easy bookmarking and browing of multiple FTP & SSH locations using either keys or keychain stored user credentials. Ranger doesn't have this.