Use strict & warnings. Fix several minor bugs uncovered by it.

Semantics of assigning to $[ changed in Perl 5, and its use is `highly
discouraged'.  Programs obviously assumed $[ affects all arrays, but
it doesn't in Perl 5.  If these programs ever worked, then certainly
not with Perl 5.  Remove the assignments and shift indexes
accordingly.

info/ls2html.pl

@@ -1,5 +1,8 @@
 #!/usr/local/bin/perl 
 
+use strict;
+use warnings;
+
 printf("<pre>\n");
 while (<>) {
     s/([\w\.\-]+)\.html/<a href=\"$1.html\">$1<\/a>/g;