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Determine installed PowerShell version
...
Use $PSVersionTable.PSVersion to determine the engine version. If the variable does not exist, it is safe to assume the engine is version 1.0.
Note that $Host.Version and (Get-Host).Version are not reliable - they reflect
the ver...
How to unstash only certain files?
...ath/To/MyFile.txt |sc Path/To/MyFile.txt - the backticks are necessary for PS to not interpret the braces specially, and the sc is necessary because PS's > operator defaults to UTF-16 (actually UCS-2) which is probably not what you want. @Balamurugan A's answer doesn't suffer from these issues.
...
MySql server startup error 'The server quit without updating PID file '
...ably problem with permissions
check if any mysql instance is running
ps -ef | grep mysql
if yes, you should stop it, or kill the process
kill -9 PID
where PID is the number displayed next to username on output of previous command
check ownership of /usr/local/var/mysql/
ls -laF /u...
Execute another jar in a Java program
...lic static void main(String []args) throws Exception
{
Process ps=Runtime.getRuntime().exec(new String[]{"java","-jar","A.jar"});
ps.waitFor();
java.io.InputStream is=ps.getInputStream();
byte b[]=new byte[is.available()];
is.read(b,0,b.length);
Sy...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...译。
glibc ptmalloc2
ptmalloc2即是我们当前使用的glibc malloc版本。
ptmalloc原理
系统调用接口
上图是 x86_64 下 Linux 进程的默认地址空间, 对 heap 的操作, 操作系统提供了brk()系统调用，设置了Heap的上边界； 对 mmap 映射区域的操作,...
How to fix Error: listen EADDRINUSE while using nodejs?
...or me was:
killall -9 node
But this will kill a system process.
With
ps ax
you can check if it worked.
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互联网金融创业大赛收官 揭示创业三大风向标 - 资讯 - 清泛网 - 专注C/C++...
...选，鏖战5个月有余，“玖富杯”互联网金融创业大赛终最终于9月9日落下帷幕。房司令、沐金农、91物流邦从100多支战队中脱颖而出，位列三甲。
“玖富杯”创业大赛颁奖现场
9月9日，创业大赛总决赛结果见分晓之时，恰逢玖...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...机小数 (random fraction)
设定随机数种子 (random set seed to)
最小值 (min)
最大值 (max)
平方根 (square root)
绝对值 (abs)
相反数 (neg)
对数 (log)
e^
四舍五入 (round)
上取整 (ceiling)
下取整 (floor)
求模 (modulo)
余数 (remainder)
商...
Does ruby have real multithreading?
...ple Ruby program which uses 3 threads using Ruby 2.1.0:
(jalcazar@mac ~)$ ps -M 69877
USER PID TT %CPU STAT PRI STIME UTIME COMMAND
jalcazar 69877 s002 0.0 S 31T 0:00.01 0:00.04 /Users/jalcazar/.rvm/rubies/ruby-2.1.0/bin/ruby threads.rb
69877 0.0 S 31T 0:00...
创业 比“直男癌”更可怕的是“技术癌” - 资讯 - 清泛网 - 专注C/C++及内核技术
...更要命的是，要想做到足够的系统跟踪深度，其实只需要最原始的塑料耳标，结合现成的简单跟踪系统，再加上生病小猪的隔离喂养和记录，就完全可以达到同等效果。而成本呢？塑料耳标的成本也就是两三元，总体成本不到“...