BusyBox combines tiny versions of many common UNIX utilities into a single small executable.
BusyBox (“the Swiss Army knife of embedded Linux”) combines common command-line utilities into a single executable. It includes a shell, file utilities such as
cp, text utilities such as
sed, basic system utilities such as
syslogd, system administration utilities such as
sysctl, networking utilities such as
ifconfig, and more. It is intended for small Linux systems such as boot floppies and embedded devices.