Here is a short example of writing to a file and rewinding it for reading. Note the +> in the open:

    #!/usr/local/bin/perl -w

    use strict;

    open MYFILE, "+>somefile.txt" or die "Error message here: $!\n";

    # Write to the file
    print MYFILE "These are the days\n";
    print MYFILE "and these are the days\n";

    # Rewind the file for reading
    seek(MYFILE, 0, 0);

    while (<MYFILE>) {
        print $_;
    }

    close MYFILE;
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See also perlopentut.

--
John.