BusyBox
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BusyBox provides many common UNIX utilities in a single small executable for embedded systems.
Note: Do not expect full drop-in replacement and compatibility. Certain utilities may not exist and for those that do, there may be missing options.
Installation
Busybox commands are symbolic links to /usr/bin/busybox and thus take very little space. This is especially interesting for low-footprint systems.
Usage
init
Init scripts can be used together with busybox-init, for example minirc-gitAUR. See init for details.
getty
The gettys are defined in the file /etc/inittab, By default getty is started on ttys 1 through 4.
In order to enable/disable gettys, you just put this line in /etc/inittab.
tty2::respawn:/sbin/agetty -8 -s 38400 tty2 linux
Just replace tty2 with the tty, you want getty to start on.
If you want init to ask you before starting the gettty, then replace respawn with askfirst.
mdev
See Gentoo wiki.