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  • wall -- write a message to users

    wall [-n] [-t TIMEOUT] [file]
    Wall displays the contents of file or, by default, its standard input, on
         the terminals of all currently logged in users. The command will cut over
         79 character long lines to new lines. Short lines are white space padded
         to have 79 characters. The command will always put carriage return and
         new line at the end of each line.
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