stout:~ [16:28:32]$ strace -eopen,unlink perl -e 'open $f, "+>", undef'
open("/etc/ld.so.preload", O_RDONLY)    = 3
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/libpthread.so.0", O_RDONLY)  = 3
open("/lib/libnsl.so.1", O_RDONLY)      = 3
open("/lib/libdl.so.2", O_RDONLY)       = 3
open("/lib/libm.so.6", O_RDONLY)        = 3
open("/lib/libcrypt.so.1", O_RDONLY)    = 3
open("/lib/libutil.so.1", O_RDONLY)     = 3
open("/lib/libc.so.6", O_RDONLY)        = 3
open("/dev/urandom", O_RDONLY|O_LARGEFILE) = 3
open("/dev/null", O_RDONLY|O_LARGEFILE) = 3
open("/tmp/PerlIO_dr5fu4", O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0600) = 3
unlink("/tmp/PerlIO_dr5fu4")            = 0
Process 17389 detached