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Test if remote TCP port is open from a shell script
...ing with 0 on success, 1 on failure.
For a quick interactive check (with a 5 seconds timeout):
nc -z -v -w5 <host> <port>
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Maintain aspect ratio of div but fill screen width and height in CSS?
... and without scrollbars!
(PURE) CSS
div
{
width: 100vw;
height: 56.25vw; /* height:width ratio = 9/16 = .5625 */
background: pink;
max-height: 100vh;
max-width: 177.78vh; /* 16/9 = 1.778 */
margin: auto;
position: absolute;
top:0;bottom:0; /* vertical center */
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C++ Best way to get integer division and remainder
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answered Aug 15 '11 at 20:23
cnicutarcnicutar
160k2121 gold badges306306 silver badges343343 bronze badges
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Cannot download Docker images behind a proxy
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25 Answers
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Remove all files except some from a directory
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awiawi
2,65611 gold badge1515 silver badges1212 bronze badges
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How do I make my string comparison case insensitive?
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answered Feb 8 '10 at 8:52
Michael BavinMichael Bavin
3,57466 gold badges2727 silver badges3535 bronze badges
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Hide text using css
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435
This is one way:
h1 {
text-indent: -9999px; /* sends the text off-screen */...
How can I get Maven to stop attempting to check for updates for artifacts from a certain group from
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35
The updatePolicy tag didn't work for me. However Rich Seller mentioned that snapshots should be ...
Using SSH keys inside docker container
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154
It's a harder problem if you need to use SSH at build time. For example if you're using git clo...
App Inventor 2 JDY-34双模蓝牙模块配置与通信教程 · App Inventor 2 中文网
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参数
值
蓝牙版本
5.0双模（SPP + BLE）
工作电压
3.3V（IO口3.3V）
通信接口
UART串口
波特率
默认9600
传输距离
约30米（开放环...