Technically, no, they aren't. Unix running on a PDP-11 uses linefeed (ASCII 10.)
as its linebreak code.
What you meant, but did not say, is that DEC OSes running on PDP-11s use the
carriage return + linefeed pair (ASCII 13. + ASCII 10.). However, this is not
limited to PDP-11s, but is a feature of all DEC operating systems across all
seven general computing architectures (PDP-1, PDP-4/7/9/15, PDP-5/8/12,
PDP-6/10, PDP-11, VAX, Alpha) created by DEC.
Rich Alderson ne...@alderson.users.panix.com
Audendum est, et veritas investiganda; quam etiamsi non assequamur,
omnino tamen proprius, quam nunc sumus, ad eam perveniemus.