-e "s/^\(Message-Id:\).*/\1 MESSAGE-ID-STRING/" \
-e "s/^\(X-Mailer:\).*/\1 X-MAILER-STRING/" \
>actual-show-all-headers &&
- diff -u expected-show-all-headers actual-show-all-headers
+ test_cmp expected-show-all-headers actual-show-all-headers
'
z8=zzzzzzzz