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  1. or download this
    #!/usr/bin/env perl -w
    
  2. or download this
    $ ./666330.pl
    /usr/bin/env: perl -w: No such file or directory
    
  3. or download this
    $ strace -e trace=execve ./666330.pl
    execve("./666330.pl", ["./666330.pl"], [/* 24 vars */]) = 0
    ...
    execve("/bin/perl -w", ["perl -w", "./666330.pl"], [/* 24 vars */]) = 
    +-1 ENOENT (No such file or directory)
    execve("/usr/bin/X11/perl -w", ["perl -w", "./666330.pl"], [/* 24 vars
    + */]) = -1 ENOENT (No such file or directory)
    /usr/bin/env: perl -w: No such file or directory