引用:

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ffffiiiilllleeee::::ppppaaaatttthhhhnnnnaaaammmmeeee
                the first line of ppppaaaatttthhhhnnnnaaaammmmeeee is the password. If the same ppppaaaatttthhhh----
                nnnnaaaammmmeeee argument is supplied to ----ppppaaaassssssssiiiinnnn and ----ppppaaaassssssssoooouuuutttt arguments
                then the first line will be used for the input password and
                the next line .......

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引用:

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      To  get  a  plain  text  version  of  a  man page, without
      backspaces and underscores, try

        # man foo | col -b > foo.mantxt

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