刚刚无意中逛到这个有趣的东西（又从孤陋寡闻中往上爬了一步啦～） http://tiswww.case.edu/php/chet/readline/rltop.html 它就是我们作业中的cmdParser 我觉得最有趣的地方是它支援开启时读入设定档（~/.xxxxrc） bash, emacs都是用这个library XD 下面节录的指令是emacs like的 但是居然还可以设成vi like set editing-mode vi The GNU Readline library provides a set of functions for use by applications that allow users to edit command lines as they are typed in. Both Emacs and vi editing modes are available. The Readline library includes additional functions to maintain a list of previously-entered command lines, to recall and perhaps reedit those lines, and perform csh-like history expansion on previous commands. 1.2.1 Readline Bare Essentials C-b Move back one character. C-f Move forward one character. DEL or Backspace Delete the character to the left of the cursor. C-d Delete the character underneath the cursor. Printing characters Insert the character into the line at the cursor. C-_ or C-x C-u Undo the last editing command. You can undo all the way back to an empty line. 1.2.2 Readline Movement Commands C-a Move to the start of the line. C-e Move to the end of the line. M-f Move forward a word, where a word is composed of letters and digits. M-b Move backward a word. C-l Clear the screen, reprinting the current line at the top. 看到跟作业有相关就忍不住贴上来了:p --

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