... open("/tmp/PerlIO_Ol6dlF", O_RDWR|O_CREAT|O_EXCL, 0600) = 3 unlink("/tmp/PerlIO_Ol6dlF") = 0 open("/tmp/PerlIO_WFvCgM", O_RDWR|O_CREAT|O_EXCL, 0600) = 3 unlink("/tmp/PerlIO_WFvCgM") = 0 open("/tmp/PerlIO_su06bT", O_RDWR|O_CREAT|O_EXCL, 0600) = 3 unlink("/tmp/PerlIO_su06bT") = 0 open("/tmp/PerlIO_HAAg8Z", O_RDWR|O_CREAT|O_EXCL, 0600) = 3 unlink("/tmp/PerlIO_HAAg8Z") = 0 Use of uninitialized value in open at ./799021.pl line 32. open("", O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 ENOENT (No such file or directory) ... #### As a special case the 3-arg form with a read/write mode and the third argument being "undef": open(TMP, "+>", undef) or die ... opens a filehandle to an anonymous temporary file.