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What is the difference between active and passive FTP?
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edited Apr 19 '18 at 6:38
answered Nov 9 '09 at 4:57
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How to test an Internet connection with bash?
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136
Without ping
#!/bin/bash
wget -q --spider http://google.com
if [ $? -eq 0 ]; then
echo ...
Safe (bounds-checked) array lookup in Swift, through optional bindings?
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19 Answers
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What is the difference between 'classic' and 'integrated' pipeline mode in IIS7?
...er than classic?
– Alex Nolasco
Feb 16 '12 at 17:03
I'm not sure if it's correct to say that asp.net is a part of IIS....
Real world use cases of bitwise operators [closed]
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41 Answers
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How to execute an .SQL script file using c#
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10 Answers
10
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ImportError in importing from sklearn: cannot import name check_build
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13 Answers
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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
... Queuing Telemetry Transport：消息队列遥测传输）
MQTT 发明于 1999 年，为物联网设计的轻量级协议，基于TCP协议实现。
MQTT 协议文档：https://mqtt.org/
虽然 App Inventor 有现成的 MQTT 扩展，但它们需要额外的 JavaScript 或外部...