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Defining a variable with or without export
...ve values copied when the subprocess is created:
$ export B="Bob"; echo '(sleep 30; echo "Subprocess 1 has B=$B")' | bash &
[1] 3306
$ B="Banana"; echo '(sleep 30; echo "Subprocess 2 has B=$B")' | bash
Subprocess 1 has B=Bob
Subprocess 2 has B=Banana
[1]+ Done echo '(sleep 30; echo "S...
Where can I set environment variables that crontab will use?
...ANG=nb_NO.UTF-8
LC_ALL=nb_NO.UTF-8
# m h dom mon dow command
* * * * * sleep 5s && echo "yo"
This feature is only available to certain implementations of cron. Ubuntu and Debian currently use vixie-cron which allows these to be declared in the crontab file (also GNU mcron).
Archlin...
How does lock work exactly?
...
No, they are not queued, they are sleeping
A lock statement of the form
lock (x) ...
where x is an expression of a reference-type, is precisely equivalent to
var temp = x;
System.Threading.Monitor.Enter(temp);
try { ... }
finally { System.Threading.Mo...
Are there any worse sorting algorithms than Bogosort (a.k.a Monkey Sort)? [closed]
...
I'm surprised no one has mentioned sleepsort yet... Or haven't I noticed it? Anyway:
#!/bin/bash
function f() {
sleep "$1"
echo "$1"
}
while [ -n "$1" ]
do
f "$1" &
shift
done
wait
example usage:
./sleepsort.sh 5 3 6 3 6 3 1 4 7
./sleep...
如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...作主观要服从客观，“交易有依据、欲望要消除”；
B) 模拟操作不可少，即使不交易，依然要“仔细看盘、仔细复盘、揣摩多空主力的思路、勤动脑多实践”，最终做到“正确地知行合一”。
系统交易，即按照一套交易系统...
Selenium WebDriver: Wait for complex page with JavaScript to load
...en your page is finished processing you need to add a delay: e.g. click(), sleep(0.5 sec), wait until (readyState='complete' & jQuery.active==0). If you don't add the sleep, the iQuery will not be active at the test time! (it took me some hours to find out, so I thought to share it)
...
What exactly are “spin-locks”?
...ge the process state from TASK_RUNNING into TASK_INTERRUPTIBLE (which is a sleeping state) and, thus, it does not save everything about that process (memory, cache and so on). instead, the spinning process is preempted, but it never quits the "immediately schedulable" processes: it is kept in memory...
Correct way to detach from a container without stopping it
...6]$ docker run -ti -d --name test python:3.6 /bin/bash -c 'while [ 1 ]; do sleep 30; done;'
b26e39632351192a9a1a00ea0c2f3e10729b6d3e22f8e0676d6519e15c08b518
[berto@g6]$ docker attach test
# here I typed ^P^Q
read escape sequence
# i'm back to my prompt
[berto@g6]$ docker kill test; docker rm -v te...
ATL正则表达式库使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的另一个正则表达式类库）不同，CATLRegExp并没有在构造函数中提供初始化匹配字符串的方法，而是让使用者通过调用它的Parse()方法，使用正则表达式字符串作为参数，就可以构造出一个我们所需要的用于匹配的类，例如我们需...
全球首例3D彩色全息图面世 VR技术再获重大突破 - 资讯 - 清泛网 - 专注C/C+...
...何谓VR，又何谓AR？简单来说，VR技术利用计算机生成一种模拟环境，使用户能够与该环境互动；而AR技术则能够把虚拟信息融合在现实环境中，让现实世界丰富起来。
国际科技巨头纷纷布局虚拟现实，代表最前沿技术的产业巨...