12.4 Operating on the Region

Once you have a region and the mark is active, here are some of the ways you can operate on the region:

• Kill it with C-w (see section Killing and Moving Text).
• Save it in a register with C-x r s (see section Registers).
• Save it in a buffer or a file (see section Accumulating Text).
• Convert case with C-x C-l or C-x C-u (see section Case Conversion Commands).
• Indent it with C-x <TAB> or C-M-\ (see section Indentation).
• Fill it as text with M-x fill-region (see section Filling Text).
• Print hardcopy with M-x print-region (see section Printing Hard Copies).
• Evaluate it as Lisp code with M-x eval-region (see section Evaluating Emacs Lisp Expressions).
• Undo changes within it using C-u C-x u (see section Undo).

Most commands that operate on the text in the region have the word region in their names.