Subscribe to RSSBusyBox is a software suite that provides several Unix utilities in a single executable file. It 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 common commands. Originally written by Bruce Perens in and declared complete for his intended usage in BusyBox originally aimed to put a complete bootable system on a single floppy disk that would serve both as a rescue disk and as an installer for the Debian distribution. Since that time, it has been extended to become the de facto standard core user space toolset for embedded Linux devices and Linux distribution installers. Since each Linux executable requires several kilobytes of overhead, having the BusyBox program combine over two hundred programs together often saves substantial disk space and system memory. Cinege made several additions, created a modularized build environment, and shifted BusyBox's focus into general high-level embedded systems. During this time the Linux embedded marketplace exploded in growth, and BusyBox matured greatly, expanding both its user base and functionality. Rob Landley became the maintainer in until latethen Denys Vlasenko took over as the current maintainer. Since OctoberDenys Vlasenko has taken over maintainership of BusyBox from Rob Landley, who has started Toyboxalso as result of the license controversies. The case was settled with release of the Monsoon version of the source and payment of an undisclosed amount of money to Andersen and Landley. Best Buy, et al. No other developers, including original author Bruce Perens and maintainer Dave Cinege, were represented in these actions or party to the settlements. On December 15,Perens released a statement expressing his unhappiness with some aspects of the legal situation, and in particular alleged that the current BusyBox developers "appear to have removed some of the copyright statements of other Busybox developers, and appear to have altered license statements". BusyBox can be customized to provide a subset of over two hundred utilities. It can provide most of the utilities specified in the Single Unix Specification SUS plus many others that a user would expect to see on a Linux system. BusyBox uses the Almquist shellalso known as A Shell, ash and sh. As it is a complete bootstrap system, it will further replace the init daemon and udev or the latter-day systemd using itself to be called as init on startup and mdev at hotplug time. The BusyBox Web site provides a full list of the utilities implemented. Typical computer programs have a separate binary executable file for each application. BusyBox is a single binary, which is a conglomerate of many applications, each of which can be accessed by calling the single BusyBox binary with various names supported by having a symbolic link or hard link for each different name  in a specific manner with appropriate arguments. BusyBox benefits from the single binary approach, as it reduces the overhead introduced by the executable file format typically ELFand it allows code to be shared between multiple applications without requiring a library. This technique is similar to what is provided by the crunchgen  command in FreeBSDthe difference being that BusyBox provides simplified versions of the utilities for example, an ls command without file sorting abilitywhile a crunchgen generated sum of all the utilities would offer the fully functional versions. Sharing of the common code, along with routines written with size-optimization in mind, can make a BusyBox system use much less storage space than a system built with the corresponding full versions of the utilities replaced by BusyBox. Research  that compared GNUBusyBox, asmutils and Perl implementations of the standard Unix commands showed that in some situations BusyBox may perform faster than other implementations, but not always. The official BusyBox documentation lists an overview of the available commands and their command-line options. List of BusyBox commands . Programs included in BusyBox can be run simply by adding their name as an argument to the BusyBox executable:. More commonly, the desired command names are linked using hard or symbolic links to the BusyBox executable; BusyBox reads argv to find the name by which it is called, and runs the appropriate command, for example just. Busybox would see that its "name" is "ls" and act like the "ls" program. BusyBox is used by several operating systems running on embedded systems and is an essential component of distributions such as OpenWrtOpenEmbedded including the Yocto Project and Buildroot. The Sharp Zaurus utilizes BusyBox extensively for ordinary Unix-like tasks performed on the system's shell. It is necessary for several root applications on Android and is also preinstalled with some "1 Tap Root" solutions such as Kingo Root. At the end of  it was re-licensed under the BSD License after the project went dormant. He suggested it be based on the dormant Toybox.
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I want to thank the following companies which are providing support for the BusyBox project: Analog Devices, Inc. If you are an embedded device developer, please note that Analog Devices has an entire Linux distribution available for download for this board. BusyBox 1. Bug fix release. Sizes of busybox Closes ash: distinguish 'wait -n' from other bashisms ash: an unset dynamic variable should not be dynamic ash: add bash-compatible EPOCH variables ash: prevent error in backquotes in PS1 from exiting shell ash: catch error in arithmetic expansion in PS1 hush: add bash-compatible EPOCH variables du: don't count duplicate arguments. Closes man: don't skip default path which appears in config file stat: reduce storage for human-readable filesystem names vi: fix faulty undo after autoinsert vi: fix replacement of single character with CR vi: further fixes to undo after autoindent vi: allow manual screen update if SIGWINCH isn't supported vi: avoid build failure in non-default case vi: fix changes to word at end of line. Closes vi: enable 'dG' command. Changes since previous release: Andre Goddard Rosa: smemcap: keep outputting by ignoring transient processes Baruch Siach: install. Closes ntpd: skip over setting next DNS resolution attempt if it is not needed pgrep: fix "pgrep -v -P1"; also allow matching of comm. Closes unzip: do not use CDF. Closes unzip: optional support for bzip2, lzma, xz unzip: properly use CDF to find compressed files. Closes tls: a tiny TLS1. No code changes kill: need not build kill. If you are stuck with a kernel from July or earlier 2. You can work around it by reverting this patch in 1. You also probably need to plan migration to a less ancient kernel. Closes lineedit: fix completion with applet names. Closes install: fix musl problem with dirname ip: fix an improper optimization: req. Closes tc: consolidate its disabled bits tcpsvd: don't keep shared fd open if fd limit is reached. Closes unshare: --network should be --net. Closes httpd: fix heap buffer overflow. Closes iproute: support "scope". Android is based on Linux kernel, but sadly and unexplicably, Android userspace is not Unix-friendly: in many cases, things are done differently than in "usual" Unix systems. This step is device-specific. Installed the SuperSU application. Installed the Termux application - it provides a small repository of essential tools: gcc-based toolchain, git, ncurses, etc. Ran its terminal, installed packages I needed, pulled Busybox git tree. Now the usual "make defconfig", "make menuconfig", "make" work. Some parts won't compile not all kernel headers are present, libc API different or incomplete, etc. The toolchain provided by Termux is based on Android's Bionic libc and Bionic has some design problems. Build system has a fix for the lost link-time optimizations. It provides minimalist replacements for most of the utilities you usually find in GNU coreutils, util-linux, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox has been written with size-optimization and limited resources in mind. It is also extremely modular so you can easily include or exclude commands or features at compile time. This makes it easy to customize your embedded systems. BusyBox is extremely configurable. This allows you to include only the components you need, thereby reducing binary size. Run 'make config' or 'make menuconfig' to select the functionality that you wish to enable. Then run 'make' to compile BusyBox using your configuration. After the compile has finished, you should use 'make install' to install BusyBox. BusyBox is a multi-call binary. A multi-call binary is an executable program that performs the same job as more than one utility program. That means there is just a single BusyBox binary, but that single binary acts like a large number of utilities. This allows BusyBox to be smaller since all the built-in utility programs we call them applets can share code for many common operations. You can also invoke BusyBox by issuing a command as an argument on the command line. For example, entering. So most people will invoke BusyBox using links to the BusyBox binary. Generally speaking, you should never need to make all these links yourself, as the BusyBox build system will do this for you when you run the 'make install' command. If you invoke BusyBox with no arguments, it will provide you with a list of the applets that have been compiled into your BusyBox binary. Most BusyBox applets support the --help argument to provide a terse runtime description of their behavior. Read and optionally set system timebase parameters. See adjtimex 2. A script consists of one or more "expect-send" pairs of strings, each pair is a pair of arguments. Extract or list files from a cpio archive, or create an archive -o or copy files -p using file list on stdin. Give PROG a controlling tty if possible. Tiny RPN calculator. Compare files line by line and output the differences between them. This implementation supports unified diffs only. Disk space is printed in units of bytes.