Busybox

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Busybox, appropriately dubbed "The Swiss Army Knife of Embedded Linux", is a utility that combines tiny versions of many common UNIX utilities into a single small executable.

Installation

Emerge

root #emerge --ask sys-apps/busybox

Usage

You can find a handful of UNIX utilities inside busybox. To use one, execute busybox, followed by the utility name.

root #busybox vi

This command will open up Busybox's instance of vi.

Note
Busybox vi may exist on a system where vi does not. Busybox vi is completely separate from the coreutils installed on your system, and is found in one binary.