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> The standard editor is not always standard, it seems.

Linux distros don’t follow a standard anymore, as as I can tell. And Linux was never entirely POSIX compliant.

yeah, unfortunately, despite literally being specified in posix (hell, macos bundles it)

one of these days i will go around pestering distro release engineers to include it; after all, it's less heavyweight than any one of their homespun lightdm greeters

The set of utilities specified in POSIX is, erm, not entirely sensible[1]. Though POSIX is more helpful than most large standards I’ve seen, it still ends up mostly having partial implementations (are there any completely 2008-compliant systems, I wonder?).

[1] http://www.landley.net/toybox/roadmap.html#susv4

Why not use sed?

Because it’s not standard.

No, it is. And as other people have pointed out, it ships on more distros.

https://pubs.opengroup.org/onlinepubs/009604499/utilities/se...

It's "ed" which is de facto non-standard.