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How to mkdir only if a directory does not already exist?

... The old tried and true mkdir /tmp/qq >/dev/null 2>&1 will do what you want with none of the race conditions many of the other solutions have. Sometimes the simplest (and ugliest) solutions are the best. ...
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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

...子,2006年的时候我看到过一个项目:当时频频爆出食品安全事故(现在似乎也没有好多少),有人就结合当时方兴未艾的RFID技术做了一整套的生猪养殖过程监控系统。他们的解决方案是这样的:给每一头猪都打上一个RFID耳标,而...
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Purpose of Unions in C and C++

... @CiroSantilli新疆改造中心六四事件法轮功 A part of an example from C++ Primer, might help. wandbox.org/permlink/cFSrXyG02vOSdBk2 – Rick Sep 29 '18 at 11:42 ...
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滚动布局管理器拓展 - ScrollArrangementHandler · App Inventor 2 中文网

...者所有。 原作者:ColinTree 原始网址:https://mp.weixin.qq.com/s/1k6PFZT7HANyUEG3q1PnLQ 参考讨论:https://bbs.tsingfun.com/thread-1632-1-1.html 您的改进建议 联系方式: 不需要回复的可留空~ 意...
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ComponentGroup 组件组扩展:监控内容变化和批量启用禁用组件 · App Inventor 2 中文网

...误。 重复添加:重复将同一组件添加到同一组是安全的,不会产生错误。 组件名称:由于 App Inventor 的限制,无法通过代码获取组件在项目中的名称。因此建议使用 AddNamedComponent 为组件指定有意义的名称。 Co...
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What is the difference between the add and offer methods in a Queue in Java?

... q.offer(b); boolean is6 = q.offer(b); System.out.println("qq::"+q); – Raj Nov 20 '18 at 12:15 Thanks,...
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Vim: insert the same characters across multiple lines

...d would then repeat it. Put your cursor on the first letter in name. Hit qq to start recording into the q buffer. Hit i to go into insert mode, type vector_, and then hit Esc to leave insert mode. Now hit 0 to go back to the beginning of the line. Now hit j to go down. Now hit q again to stop reco...
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MySQL主从服务器数据一致性的核对与修复 - 数据库(内核) - 清泛网 - 专注C/...

...令的时候直接键入了密码等敏感信息,这在很多时候是不安全的,比如说别人可以通过查看命令历史拿到密码。还好我们有「ask-pass」选项可以解决此类问题,实际上我们还可以更进一步,直接把密码等敏感信息保存到配置文件...
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MyListView 拓展:可定制列表 · App Inventor 2 中文网

...nTextItem("img1.png", "微信") MyListView1.AddIconTextItem("img2.png", "QQ") MyListView1.AddIconTextItem("img3.png", "微博") } 带图标+双行文字的列表(仿聊天列表) when Screen1.Initialize() { MyListView1.Initialize(VerticalArrangement1) // 添加...
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jQuery scroll to element

...ited Jul 8 '18 at 14:48 php_nub_qq 11.9k1717 gold badges5454 silver badges117117 bronze badges answered Jul 13 '11 at 9:52 ...