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Executing Shell Commands: ~! and ~|

The `~!' escape executes specified command and returns you to `mail' compose mode without altering your message. When used without arguments, it starts your login shell. The `~|' 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, `mail' assumes that something went wrong and retains the old contents of your message.

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