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  1. or download this
    $ strace -e open perl -e 'open $f, "+>", undef' 2>&1 | tail -n 1
open("/tmp/PerlIO_vfNALU", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0600) = 
+3
  2. or download this
    $ perl -le 'open $f, "+>", undef;
print readlink "/proc/self/fd/" . fileno $f'
/tmp/PerlIO_vJg2Uf (deleted)
  3. or download this
    $ perl -le 'open $f, "+>", undef;
print readlink "/proc/self/fd/" . fileno $f'
/tmp/.nfs0004821b00000353