<izabera> ` printf \'FNR == 1{ for (i = max; i >= 1; i--) print a[i] } { a[max=FNR] = $0 } END { for (i = max; i >= 1; i--) print a[i] }\' > bin/tac; chmod +x bin/tac

#!/usr/bin/perl
use Encode; binmode *$_,"encoding(utf8)" for STDIN,STDOUT; local$/; for (split//,<STDIN>) { rand(5)<3 and y/EOeo/\xc4\xc5\xe4\xe5/; print }