我可以要求用户通过使用阅读按Enter键，并让他通过调用sleep等待。但我不能想出一个同时做这两个方法。我想让用户选择：
按Ctrl C键取消，按Enter键继续或等待10秒钟
我怎样才能做到这一点？
在bash中，read有一个-t选项，您可以在其中指定超时。从联机帮助页：
read [-ers] [-u fd] [-t timeout] [-a aname] [-p prompt] [-n nchars] [-d delim] [name ...]
-t timeout:cause read to time out and return failure if a complete line of input is not read within timeout seconds. This option has no effect if read is not reading input from the terminal or a pipe.
下面的脚本(不输入ENTER)：
$ date ; read -t 10 -p "Hit ENTER or wait ten seconds" ; echo ; date Tue Feb 28 22:29:15 WAST 2012 Hit ENTER or wait ten seconds Tue Feb 28 22:29:25 WAST 2012
另一个，几秒钟后按ENTER键：
$ date ; read -t 10 -p "Hit ENTER or wait ten seconds" ; date Tue Feb 28 22:30:17 WAST 2012 Hit ENTER or wait ten seconds Tue Feb 28 22:30:19 WAST 2012
另一个，CTRL-C：
$ date ; read -t 10 -p "Hit ENTER or wait ten seconds" ; echo ; date Tue Feb 28 22:30:29 WAST 2012 Hit ENTER or wait ten seconds
