Colorized impossible.gnu.sed

    #n
    #!/bin/sed -f
    #  Sort, partition, and number a list of names in only 14 sed commands.
    #  By Greg Ubben, 14 Nov 1996
    #
    #  Use with -n option to prevent a trailing blank line.
    #  Assumes no control characters, even though the sort handles tabs.

    #  Sed insertion sort by Greg Ubben, 26 April 1989.  All rights reserved.
    #  Note that the code contains some unprintable Ctrl-A and Tab characters.
    #  The \(\(.\)\) have been unnested to allow for some brain-damaged seds.
    #  Some overlap with next; s:/:/.: the last command for a stand-alone sort.

    G
    1 s/\n/&&	 !"#$%\&'()*+,-.\/0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~/
    s/\([	 -~]*\)\(\n\)/\2\1/
    s/^\(.[	 -~]*\)\([	 -~]\)\([	 -~]*\)\(.*\1\)\([	 -~]\)\([	 -~]*\)\(.*\n.*\5[	 -~]*\2[ -~]*\)$/\4\5\6\1\2\3\7/
    h
    $ !d
    s///g
    s/\(.*\)\n.*/\1/

    #  Output, adding a blank line between sections and numbering each section.
    #  The do-nothing X* below is needed on the SunOS 4.1 sed to work around a
    #  RE bug that occurs when a non-null c* closure precedes a null \n recall.

    :loop
    s/\([0-9]*\)[ -~]*\n/\1;9876543210990090 /
    s/\([0-8]\{0,1\}\)\(9*\);[^1]*\(.\)\1[0-9]*X*\2\(0*\)[^ ]*/\3\4/
    P
    /^[0-9]* \(.\).*\n\1/ !s/[ -~]*//
    /^\n/ P
    /./ b loop

    ### colorized by sedsed, a debugger and code formatter for sed scripts