It turns out that there are two versions of Busybox, at least on Ubuntu
18.04. If you have the busybox-static package installed, you get a
busybox that supports `ps a` and `head`. If you only have
busybox-initramfs, you don't. Either way, you have `awk`.
This change should also make this compatible with GNU ps, if you somehow
end up with that in the initramfs environment.
Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Andrey Prokopenko <job@terem.fr>
Signed-off-by: Richard Laager <rlaager@wiktel.com>
Closes#10307
7fcf82451c