在Snow Leopard的Terminal里面用sudo的时候总是需要输入密码，而在单位的FreeBSD服务器上则不需要。我觉得从安全角度来说这个密码用处不大，有了反而会浪费时间。
搜索了一下，发现要这样做：
修改/etc/sudoers文件（记得sudo vi它，存的时候要w!），去掉这一行前面的#号：
%wheel ALL=(ALL) NOPASSWD: ALL
然后执行下面命令，记得将your_username替换为你的用户名：
sudo dscl . append /Groups/wheel GroupMembership your_username
从此就不需要在sudo的时候输入密码了。
The perfect is the enemy of the good. The best is the enemy of the good. – Voltaire
Perfectionism kills me.
回复一位敬佩的前端工程师kejun的一篇博文，更好的标注UI规格
我能理解作为前端工程师为什么希望这样标注，但是这些标注的实用价值很低，原因如下:
http://en.wikipedia.org/wiki/Three_Times_a_Lady“Three Times a Lady” is a 1978 single from the funk/soul band the Commodores, from their 1978 album Natural High. It was produced by James Anthony Carmichael and the Commodores and it was the most popular track of the album.
In an appearance on The Early Show on June 12, 2009, Richie said he was inspired to write it by a comment his father made about his mother. Reportedly his father said to his mother “I love you. I want you. I need you. Forever” hence the three times. It became the Commodores’s first Billboard Hot 100 number-one hit, topping the chart for two weeks on August 12, 1978. [2]. It was also the only Motown song to reach the Top 10 that year. The song also spent three weeks at #1 on the adult contemporary chart. It was one of only a few Motown singles to reach the top spot in the UK. In the years since the Commodores had started in 1974 it has been one of their most emotional songs since “You Don’t Know That I Know” from the album Caught in the Act in 1975.
The original Commodores’ version of the song was included as the final track on Lionel Richie’s greatest hits compilation album Back To Front, released in 1992.
似乎有点道理
这两天要用我的MBP（Mid 2009 MC118）刻录一张DVD却总是失败，告诉我使用的DVD盘片不兼容，或者刻录速度太快（我试验了1, 2, 4, 8都不行），让我尝试其它品牌的盘片。但是之前我用的威宝的日产DVD-R一直没有这个问题，所以查看了一下system.log，发现报错的内容是这样的：
Disk Utility[378]: Disk Utility: Burn to DVD-R (TYG02) media in MATSHITA DVD-R UJ-868 (KB19) via ATAPI failed with error 0x8002006D and sense (3/73/03 Medium Error, Power calibration area error).
Google到了很多信息，讨论的很复杂，大意就是光驱坏掉了，或者锁了区码。看到了这篇比较有用Can’t burn DVD’s with a MacBook Pro?，说先试试清理尘土。
然后就打开了MBP后盖在光驱的几个角和缝的地方用皮老虎吹了一下（如果你的嘴很有力且不乱喷吐沫星子，那么也可以用嘴吹，但是这样很危险……），尘土还是挺多的。而后开机刻录就好了。
电脑知识 3:19 pm on August 3, 2010 Permalink
Hen Hao Hen Qiang Da,yeah~