(sed.info.gz) Centering lines

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 Centering Lines
 ===============
 
    This script centers all lines of a file on a 80 columns width.  To
 change that width, the number in `\{...\}' must be replaced, and the
 number of added spaces also must be changed.
 
    Note how the buffer commands are used to separate parts in the
 regular expressions to be matched--this is a common technique.
 
      #!/usr/bin/sed -f
      
      # Put 80 spaces in the buffer
      1 {
        x
        s/^$/          /
        s/^.*$/&&&&&&&&/
        x
      }
      
      # del leading and trailing spaces
      y/tab/ /
      s/^ *//
      s/ *$//
      
      # add a newline and 80 spaces to end of line
      G
      
      # keep first 81 chars (80 + a newline)
      s/^\(.\{81\}\).*$/\1/
      
      # \2 matches half of the spaces, which are moved to the beginning
      s/^\(.*\)\n\(.*\)\2/\2\1/
 

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(sed.info.gz) Increment a number