Alpine Linux:
is a Linux distribution designed to be small, simple and secure. Unlike most other Linux distributions, Alpine uses musl, BusyBox and OpenRC instead of the more commonly used glibc, GNU Core Utilities and systemd respectively.
The default shell in Alpine is the busybox provided ash
BusyBox is a software suite that provides several Unix utilities in a single executable file. It runs in a variety of POSIX environments such as Linux, Android, and FreeBSD, although many of the tools it provides are designed to work with interfaces provided by the Linux kernel.