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";
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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";
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--
John.