I would recommend using File::Temp. I think it is equally safe/reliable, gives more portability (to older Perls), and gives more flexibility.

For example, if you want your temporary files to stick around for inspection during debugging, you can just tell File::Temp not to unlink them on exit if debugging is on.

use constant DEBUG => 1;

my $fh = File::Temp->new( UNLINK => DEBUG ? 0 : 1 );
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If you're in the habit of using File::Temp, you'll always have the full flexibility it gives available to you.