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Re:GNU sed 4.2.2 released, maintainer resigns by wzm on Monday December 24, 2012 @08:31PM (#4964738)
/usr/bin/sed on Solaris 10 and earlier does not support -i. I don't know if OpenIndiana / Solaris 11's sed support -i, but OmniOS uses gnu sed by default, so OI might also.

As I recall, AIX's default sed also does not support -i, but I no longer have access to AIX systems to test against.

Re:GNU sed 4.2.2 released, maintainer resigns by kroger on Tuesday December 25, 2012 @07:07PM (#4967555)
Honestly, sed -i is so useful that I'd file a feature request if a sed didn't support it.
Re:GNU sed 4.2.2 released, maintainer resigns by mitchty on Wednesday December 26, 2012 @03:55AM (#4968660)
Its easier to just not use sed and use perl -pie instead. Ironically its much more portable to non gnu systems.