BusyBox

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BusyBox is an implementation of many Unix commands in a single executable file. It runs in various POSIX environments including Linux, Android, and FreeBSD, although many of the tools it provides are designed to work with interfaces provided by the Linux kernel. BusyBox was specifically created for embedded operating systems with very limited resources. The authors dubbed it "The Swiss Army knife of Embedded Linux", as the single executable replaces basic functions of more than 300 common commands. It is released as free software under the terms of the GNU General Public License v2, having not been moved to version 3.

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