获取N天后的时间
date -d “32 days” +%s
获取N天前的时间
date -d “32 days ago” +%s
将时间戳转换成人眼可识别的形式
date -d ’1970-01-01 UTC 1123495443 seconds’
在Ruby下将时间戳转换
Time.at(1123495443).strftime(“%Y-%m-%d”)
输出格式可以自定义 http://www.ruby-doc.org/core/classes/Time.html#M000392
偶然看到一个主机商家在使用它作服务器状态监控，并对外实时公布。于是留心看了下网上的评论，有用户反应比cacti配置方便，如果没有特殊需要，替代cacti未尝不可。
Munin is a networked resource monitoring tool that can help analyze resource trends and “what just happened to kill our performance?” problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.
http://munin-monitoring.org/
Here’s one of those little things I do frequently, but never remember the command. The ‘locate’ command searches a file name database that is updated weekly (I think the default update time is 4:30 am every Saturday morning, but only if your Mac is switched on then, which mine never is). If you try to run ‘locate’ on a database that isn’t current, files created more recently than the last update will not be found, and deleted files will be found erroneously. To update the database manually use the following command:
sudo /usr/libexec/locate.updatedb
实例:
<pre>wget -nd -r -l1 –no-parent http://media.pragprog.com/titles/rails3/code/depot_c/public/images/</pre>
安装tokyocabinet-1.4.45时./configure会出现如下错误:
configure: error: bzlib.h is required
[root@jeantoe tokyocabinet-1.4.45]# yum install bzip2-devel
