如果使用过bash的命令行功能，就会涉及到readline这个包，在《UNIX shell范例精解（第4版）》这本书中P650中 Ellie Quigley提到：“bash shell 提供两个内置的编辑器，emacs和vi，可以用来交互地编辑历史清单。在命令行使用编辑特性时，不管是在vi还是emacs模式下，都由readline函数决定按键所完成的功能。”
在我的Fedora 13系统中：
#rpm -q readline
readlin-6.1-2.fc13.i686
#rpm -qi readline
Size: 405349
Summary: A library for editing typed command lines
Description:
The Readline library provides a set of functions that allow users to edit command lines. Both Emacs and vi editing modes are available. The Readline library includes additional functions for maintaining a list of previously-entered command lines for recalling or editing those lines, and for performing csh-like history expansion on previous commands.
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