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How to export and import environment variables in windows?
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On Windows 7 64-bit, if there are two identically named variables at the User level and the System level, this command gives precedence to the User level variable and omits the System level one. This behavior makes sense, but figured it ...
拉里佩奇23条箴言帮你度过创业低谷 - 资讯 - 清泛网 - 专注C/C++及内核技术
...个公司的专利项目最终启发了拉里·佩奇创造谷歌？
一位员工曾发明了一项专利(译者注：“超链分析”技术专利)之后，想试图利用这项专利为网络信息编一个目录，但其公司却对此很不解。
所以他——李彦宏，当时的《华尔...
Meaning of = delete after function declaration
...> operator T(void) = delete;
template <class T> Vuint64& operator= (const T) = delete;
template <class T> Vuint64& operator|= (const T) = delete;
template <class T> Vuint64& operator&= (const T) = delete;
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How many random elements before MD5 produces collisions?
.... To have a 50% chance of any hash colliding with any other hash you need 264 hashes. This means that to get a collision, on average, you'll need to hash 6 billion files per second for 100 years.
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Random alpha-numeric string in JavaScript? [duplicate]
...16, 'aA'));
console.log(randomString(32, '#aA'));
console.log(randomString(64, '#A!'));
Fiddle: http://jsfiddle.net/wSQBx/2/
Alternatively, to use the base36 method as described below you could do something like this:
function randomString(length) {
return Math.round((Math.pow(36, length + 1...
How to find the Windows version from the PowerShell command line
...rkstation
OS Build Type : Multiprocessor Free
System Type : x64-based PC
System Locale : ru;Russian
Hotfix(s) : 274 Hotfix(s) Installed.,[01]: KB2849697,[02]: KB2849697,[03]:...
Windows 10 output for the same command:
OS Name : Microsoft Windows 10 Enterp...
TCP: can two different sockets share a port?
..., unused high-order source port. This way, a single client can have up to ~64k connections to the server for the same destination port.
So, this is really what gets created when a client connects to a server:
Local Computer | Remote Computer | Role
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When are you truly forced to use UUID as part of the design?
...n 4 UUID, even if you're generating quite a few UUIDs per second.
Also, 2^64 * 16 is 256 exabytes. As in, you would need to store 256 exabytes worth of IDs before you had a 50% chance of an ID collision in a single application space.
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How does the ARM architecture differ from x86? [closed]
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How can I change Mac OS's default Java VM returned from /usr/libexec/java_home
...c/java_home -verbose
Matching Java Virtual Machines (3):
1.7.0_45, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home
1.7.0_09, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_09.jdk/Contents/Home
!1.8.0, x86_64: "Java SE 8" /Library/Ja...