Inside Alpine sh is ash

Based on this Alpine OS installation:

~ $ cat /etc/os-release 
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.21.4
PRETTY_NAME="Alpine Linux v3.21"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"

We can see what is the path for each shell:

~ $ which sh
/bin/sh

~ $ which ash
/bin/ash

But if we use realpath the we can validate that all is Alquimist Shell that is the default shell to busybox binary.

~ $ realpath /bin/sh
/bin/busybox

~ $ realpath /bin/ash
/bin/busybox