Info Catalog sed: Line length adjustment sed: Examples sed: cat -n

sed: tac

 
 7.9 Reverse Lines of Files
 ==========================
 
 This one begins a series of totally useless (yet interesting) scripts
 emulating various Unix commands.  This, in particular, is a 'tac'
 workalike.
 
    Note that on implementations other than GNU 'sed' this script might
 easily overflow internal buffers.
 
      #!/usr/bin/sed -nf
 
      # reverse all lines of input, i.e. first line became last, ...
 
      # from the second line, the buffer (which contains all previous lines)
      # is *appended* to current line, so, the order will be reversed
      1! G
 
      # on the last line we're done -- print everything
      $ p
 
      # store everything on the buffer again
      h
 

Info Catalog sed: Line length adjustment sed: Examples sed: cat -n