Emacs Dired mode quick reference.

Some particular highlights are:

• To enter Dired mode simply do C-x C-f and select a directory
• To open a file or directory, move the cursor to the name of the file you want to edit and hit enter (or e)
  
• Create a directory - +
• Copy a file - S[hift]-c
• Move/rename a file - S-r
• Delete a file by pressing `d` to mark it for deletion, then press `x` to process all marked files. Press `u` to deselect a file marked for deletion.
• Press `~` to mark all backup files in the current directory for deletion (again, use `x` to actually remove them).
• Refresh the Dired screen with `g`
• Diff two files with `=`
• Mark a file with `m` and then perform a shell command on said marked files with `!`. You can also just run a command with `!`. For example, download a zip file with `!wget www.com/somezipfile.zip` and then with that zipfile under the cursor, run `!unzip`
  
• And the coolest bit, you can use regex to rename groups of files in a directory with %r. If you have Main.as and Main.2.as and you want to rename them to main.as and main.2.as, you can do `Main\(.+\).as` to `main\1.as`