Dired Mode

If you type the name of a directory after a C-x C-f command, Emacs will display the directory contents in a new buffer. By default, Emacs displays the file name, permissions, owner/group, size and timestamp of each file on a line by itself. You can visit a file by just moving the cursor to it and hitting Enter. Dired mode is unlike other modes in that single keys are used to effect commands. Here is a list of the most useful dired commands:

Left, right arrow keys or p, n Previous and next file, respectively
Enter Visit this file in this window
o Visit this file in a new window
g Refresh directory view
m Mark file
u Un-mark file
d Mark a file for later deletion
x Delete all files marked for deletion (Emacs prompts for confirmation)
D Delete this file right now (Emacs prompts for confirmation)
C Copy this file, or copy currently marked files (Emacs prompts for destination)
R Rename/move this file, or rename/move currently marked files (Emacs prompts for destination)
M Chmod this file, or chmod currently marked files (Emacs prompts for new permissions)
O Chown this file, or chown currently marked files (Emacs prompts for new owner)
G Chgrp this file, or chgrp currently marked files (Emacs prompts for new group)
+ Create directory (Emacs prompts for directory name)
! Execute shell command on this file, or currently marked files (Emacs prompts for command)