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Do you know where your variables are?

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Indeed. But it depends on the OS you're under: I'm not really sure, but I think that Windows doesn't support real anonymous files, so the temporary file that you can see should still be there somewhere.

Here I'm under Linux and I get

$ 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
but of course it is soon deleted:
$ perl -le 'open $f, "+>", undef; print readlink "/proc/self/fd/" . fileno $f' /tmp/PerlIO_vJg2Uf (deleted)
$ perl -le 'open $f, "+>", undef; print readlink "/proc/self/fd/" . fileno $f' /tmp/.nfs0004821b00000353
if run on a machine where /tmp is mounted under nfs.)

Whatever, all this is at best fragile and tricky. This interesting open feature is best suited for a file to write stuff into, to recover it later. For your application any of the other suggestions you got would be probably preferable.

I just mentioned this temp file strategy option because IMHO it would deserve to be better known.

In reply to Re^3: Temp file strategy by blazar
in thread Temp file strategy by Sprad

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