三個 P 開頭的語言...
PHP:
#!/usr/bin/env php <?php echo "\\\"\'", "\n"; echo '\\\"\'', "\n";
Perl:
#!/usr/bin/env perl use 5.010; use strict; use warnings; INIT { $a = "\\\"\'"; $b = '\\\"\''; say $a; say $b; } __END__
#!/usr/bin/env python print "\\\"\'" print '\\\"\''
結果是:
$ ./quote.php \"\' \\"' $ ./quote.pl \"' \\"' $ ./quote.py \"' \"'
這...