怎样才能最后命令的挂钟时间的Bash提示符放
问题说明
有没有一种方法嵌入的最后一个命令的墙壁经过一次在猛砸提示？我希望的东西，应该是这样的：
Is there a way to embed the last command's elapsed wall time in a Bash prompt? I'm hoping for something that would look like this:
[last: 0s][/my/dir]$ sleep 10
[last: 10s][/my/dir]$
背景
我经常长时间运行的数据运算工作，是非常有用的知道他们已经采取了多长时间，所以我可以估算它需要多长时间为未来作业。对于非常普通的任务，我继续前进，严格记录使用适当的测井技术信息。对于不太正式的工作，我只是prePEND与时间命令。
I often run long data-crunching jobs and it's useful to know how long they've taken so I can estimate how long it will take for future jobs. For very regular tasks, I go ahead and record this information rigorously using appropriate logging techniques. For less-formal tasks, I'll just prepend the command with time.
这将是很好自动时间每一个交互式命令并打印在几个字符，而不是3行的定时信息。
It would be nice to automatically time every single interactive command and have the timing information printed in a few characters rather than 3 lines.
正确答案
您可以利用对于bash这个zsh中借用吊钩：<一href=\"http://www.twistedmatrix.com/users/glyph/$p$pexec.bash.txt\">http://www.twistedmatrix.com/users/glyph/$p$pexec.bash.txt
You could utilize this zsh-borrowed hook for bash: http://www.twistedmatrix.com/users/glyph/preexec.bash.txt
与此挂钩（Mac OS X中）来完成时间：使用低吼监控长时间运行shell命令
Timing done with this hook (Mac OS X): Use Growl to monitor long-running shell commands
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