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设置用户默认权限 Umask命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...22 = 644
注：权限计算实际上是二进制位的与操作，参考All About the umask and Permissions。
操作bar.tar
shell> tar xf bar.tar
这次有点不同，我们要运行两次tar命令。
第一次：以root身份运行tar命令，然后查看目录和文件的权限，分别...
Which method performs better: .Any() vs .Count() > 0?
...th or .Count (such as ICollection<T>, IList<T>, List<T>, etc) - then this will be the fastest option, since it doesn't need to go through the GetEnumerator()/MoveNext()/Dispose() sequence required by Any() to check for a non-empty IEnumerable<T> sequence.
For just IEnumerabl...
Can I use Twitter Bootstrap and jQuery UI at the same time?
...rtino" at the bottom as my theme.
I installed them thus:
<head>
...etc...
<link rel="stylesheet" href="css/font-awesome.min.css">
<link rel="stylesheet" href="css/cupertino/jquery-ui-1.9.2.custom.min.css">
<link rel="stylesheet" href="css/bootstrap-3.3.7.min.css">
<!-- ...
Are there conventions on how to name resources?
... how to name resources in Android? For example, buttons, textViews, menus, etc.
15 Answers
...
Dynamic variable names in Bash
..." # outputs “lolilol”
echo "${!name%lol}" # outputs “loli”
# etc.
Unfortunately, there is no counterpart syntax for modifying the aliased variable. Instead, you can achieve assignment with one of the following tricks.
1a. Assigning with eval
eval is evil, but is also the simplest and ...
微博为什么限制140字(附短信70字限制考) - 闲聊区 - 清泛IT社区，为创新赋能！
...sage. We reserve 20 characters for people’s names, and the other 140 are all yours! (via Twitter FAQ)也就是说，twitter希望微博首先能做到“微”，言简意赅，其次这样的限制是考虑到短信更新状态的字数限制，本身是160字母的限制，再留20字给id长度...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
.... We reserve 20 characters for people’s names, and the other 140 are all yours! (via Twitter FAQ)
也就是说，twitter希望微博首先能做到“微”，言简意赅，其次这样的限制是考虑到短信更新状态的字数限制，本身是160字母的限制，再留20字给id...
Javascript regex returning true.. then false.. then true.. etc [duplicate]
.... In JavaScript, global regexen have state: you call them (with exec, test etc.) the first time, you get the first match in a given string. Call them again and you get the next match, and so on until you get no match and it resets to the start of the next string. You can also write regex.lastIndex= ...
What is an ORM, how does it work, and how should I use one? [closed]
...bases but the most popular is relational ( you know tables, columns, pk fk etc eg Oracle MySQL, MS-SQL )
And finally the Mapping part is where you do a bridge between your objects and your tables.
In applications where you don't use a ORM framework you do this by hand. Using an ORM framework wou...
Why does GCC generate such radically different assembly for nearly the same C code?
...dern compilers" fill in the blank, do the best job, make the fastest code, etc. Actually I saw gcc get worse from 3.x to 4.x on arm at least. 4.x might have caught up to 3.x by this point, but early on it produced slower code. With practice you can learn how to write your code so the compiler doe...