title: Filtering text through a shell command in Emacs
body: <p>In vi[m] there is the <a href="http://www.softpanorama.org/Editors/Vimorama/vim_piping.shtml" rel="noreferrer"><code>!</code> command which lets me pipe text</a> through a shell command -- like sort or indent -- and get the filtered text back into the buffer. Is there an equivalent in emacs?</p>