Note, if you call lots of -X operators in succession (i.e. for the same $_), you can use the special filehandle of a single underline to avoid repeating the stat(2) system call:

die "Can't read $_" unless -r;
die "Can't write $_" unless -w _;
die "Can't execute $_" unless -x _;
die "$_ not a file" unless -f _;
die "$_ not a directory" unless -d _;
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