Q: "What's the difference between kill -1 1 and kill 1 1" A: Driving all the way to the office to type one keystroke.
If you need to explain a joke it wasn't funny. Thus, here's what this unfunny joke means: kill -1 1: This command sends a signal to "init" telling it to re-read /etc/inittab. This file used to be edited a lot more in the days of serial ports and modems. kill 1 Tells a Unix system to drop into single user mode. In the days before remote power controls, console servers, etc. the only way out of single user mode was to be at the physical console and type "reboot" or CTRL-D.
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