quine.sed

   1 #!/bin/sed -nf
   2 # A quine for GNU sed.
   3 s:.*:   i\\\
   4         #!/bin/sed -nf\\\
   5         # A quine for GNU sed.\
   6         h\
   7         s/\\\\/\\\\\\\\/g\
   8         s/\&/\\\\\&/g\
   9         s/\:/\\\\\:/g\
  10         s/\\n/\\\\\\n/g\
  11         s/.*/s\:.*\:\&\:/\
  12         p\
  13         g\
  14         s/ \\{2,\\}//g\
  15         p:
  16 i\
  17 #!/bin/sed -nf\
  18 # A quine for GNU sed.
  19 h
  20 s/\\/\\\\/g
  21 s/&/\\&/g
  22 s/:/\\:/g
  23 s/\n/\\\n/g
  24 s/.*/s:.*:&:/
  25 p
  26 g
  27 s/ \{2,\}//g
  28 p