busybox

Minimalist variant of UNIX utilities linked in a single executable

BusyBox combines tiny versions of many common UNIX utilities into a single executable. It provides minimalist replacements for utilities usually found in fileutils, shellutils, findutils, textutils, grep, gzip, tar, and more. BusyBox provides a fairly complete POSIX environment for small or embedded systems. The utilities in BusyBox generally have fewer options than their GNU cousins. The options that are included provide the expected functionality and behave much like their GNU counterparts. BusyBox is for emergency and special use cases. Replacing the standard tools in a system is not supported. Some tools don't work out of the box but need special configuration, like udhcpc, the dhcp client.