The question isn't clear so I'm just guessing at what might be helpful.
The POSIX function tmpnam() will give you a random filename that you can use to create a temporary file (race conditions notwithstanding):
#!/usr/bin/perl -w
use strict;
use POSIX 'tmpnam';
print tmpnam(), "\n";
Alternatively, you could use File::Temp, which is core in more recent versions of perl. This will provide you with a named or unnamed filehandle without the race condition worries. It supports several flavours of temp file creation including one that allows a template to be included in the filename:
use File::Temp ':mktemp';
my ($fh, $filename) = mkstemp( "filename.XXXX" );
print $filename, "\n";
--
John.
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