sed: must do append before delete?

[Dan Jacobson]

Interesting, very interesting, where is the logic to defend:

$ yes|sed 2q|sed '$d;$a\
> hello'
y
$ yes|sed 2q|sed '$a\
> hello
> $d'
y
hello
$ sed --version
GNU sed version 3.02

seems backwards to me.  I delete the line and then write something
there, instead that something gets deleted.  Instead I write something
there and then delete that line and instead it stays.  Using the i
command instead of the a command one gets the same results.  Using
s/.*// instead of d allows the hello thru though...
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