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(screen.info)echo

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echo
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 - Command: echo [`-n'] message
     (none)
     The echo command may be used to annoy `screen' users with a
     'message of the day'. Typically installed in a global screenrc.
     The option `-n' may be used to suppress the line feed.  See also
     `sleep'.  Echo is also useful for online checking of environment
     variables.