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How to “properly” print a list?
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edited Jun 20 '18 at 6:34
fedorqui 'SO stop harming'
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package R does not exist
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Ry-♦
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answered Feb 21 '14 at 15:16
Mathijs SegersM...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
一、MQTT与TCP的区别诞生时间TCP协议诞生于1974年冷战期间。MQTT诞生于1999年互联网初期，TCP协议比MQTT协议诞生早了25年。Ashton提出IoT概念也是在1999年，因此MQTT协议生逢其时。当时MIT Auto-ID Labs的Kevin Ashton为了把宝洁的供应链上的RF...
When is TCP option SO_LINGER (0) required?
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cafcaf
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Access denied for user 'test'@'localhost' (using password: YES) except root user
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answered Dec 3 '13 at 14:17
Alberto MegíaAlberto Megía
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Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied
...d start as root and yet as root I cant access? I am running on ubuntu 12.04. No other mongo is running
28 Answers
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Git and Mercurial - Compare and Contrast
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454
Disclaimer: I use Git, follow Git development on git mailing list, and even contribute a bit t...
Apply CSS Style to child elements
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This code "div.test th, td, caption {padding:40px 100px 40px 50px;}" applies a rule to all th elements which are contained by a div element with a class named test, in addition to all td elements and all caption elements.
It is not the same as "all td, th and caption e...
Calculate date/time difference in java [duplicate]
... edited Nov 9 '18 at 13:52
vels4j
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answered Mar 18 '11 at 11:46
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Insert, on duplicate update in PostgreSQL?
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540
PostgreSQL since version 9.5 has UPSERT syntax, with ON CONFLICT clause. with the following syn...