Antonio Diaz wrote:
] Well, accepting the '^' character as an address is not required by POSIX[1].
] [1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ed.html 
<http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ed.html>

SUSv4, which you link to above, states:

    Historically, ed accepted the '^' character as an address...

Even Brian W. Kernighan’s ed(1) tutorial, which probably dates back to the 
early 70’s, references ‘^’ as an address.  What are you thinking?
-AM
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