下载源码包 bash-completion-lib:
bash-completion-lib extends bash's standard completion behavior to achieve complex command lines with just a few keystrokes. This project was conceived to produce programmable completion routines for the most common Linux/UNIX commands, reducing the amount of typing sysadmins and programmers need to do on a daily basis.
This is very similar to bash-completion package. bash-completion-lib aims to load faster and consume less memory.