$
$ sed --version
GNU sed version 4.1.5
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
$
$ cat test.txt
< Y2008 Dec blah blah blah 345
$
$ sed 's/^< /File from New Cube:\n/' test.txt
File from New Cube:
Y2008 Dec blah blah blah 345
$
$