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<h4 class="subsubsection">3.5.3.13 Executing Shell Commands: ~! and ~|</h4>
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<p>The ‘<samp>~!</samp>’ escape executes specified command and returns you to
<code>mail</code> compose mode without altering your message. When used without
arguments, it starts your login shell. The ‘<samp>~|</samp>’ escape pipes the
message composed so far through the given shell command and replaces the
message with the output the command produced. If the command produced
no output, <code>mail</code> assumes that something went wrong and retains
the old contents of your message.
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