sed -i

[Joseph Koshy]

> Recently noticed that our sed(1) differs from its GNU
> analog in that in -i mode it considers all files as a
> single sequence of lines while the latter treats each file
> independently.  The in-line mode isn't in POSIX, so it isn't
> really clear which way is correct.

Aren't sed's addresses required to be cumulative across its
input files?

http://www.opengroup.org/onlinepubs/009695399/utilities/sed.html

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