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   sed.1p    ( 1 )

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Примеры (Examples)

This sed script simulates the BSD cat -s command, squeezing
       excess empty lines from standard input.

           sed -n '
           # Write non-empty lines.
           /./ {
               p
               d
               }
           # Write a single empty line, then look for more empty lines.
           /^$/    p
           # Get next line, discard the held <newline> (empty line),
           # and look for more empty lines.
           :Empty
           /^$/    {
               N
               s/.//
               b Empty
               }
           # Write the non-empty line before going back to search
           # for the first in a set of empty lines.
               p
           '

       The following sed command is a much simpler method of squeezing
       empty lines, although it is not quite the same as cat -s since it
       removes any initial empty lines:

           sed -n '/./,/^$/p'