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How can I use “:” as an AWK field separator?
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"-F" is a command line argument, not AWK syntax. Try:
echo "1: " | awk -F ":" '/1/ {print $1}'
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Why does direction of index matter in MongoDB?
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114
MongoDB concatenates the compound key in some way and uses it as the key in a BTree.
When fin...
SQL Logic Operator Precedence: And and Or
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And has precedence over Or, so, even if a <=> a1 Or a2
Where a And b
is not the same as
Where a1 Or a2 And b,
because that would be Executed as
Where a1 Or (a2 And b)
and what you want, to make them the same, is the following (using parentheses to override rule...
Error to install Nokogiri on OSX 10.9 Maverick?
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You can also install Nokogiri on Mac OS X 10.9 Mavericks with full XCode Install using:
gem install nokogiri -- --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/libxml2
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For t...
Find the most frequent number in a numpy vector
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Best way to test if a row exists in a MySQL table
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GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...的并支持透明背景。
包名：com.KIO4_AniGif.aix / com.KIO4_AniGif10.aix（Android 10+）
技术基础：基于 GifDecoder.java 开发，包含大量修改
最后更新：2022年6月21日
下载链接
扩展文件需从外部网站获取：
com.KIO4_AniGif.aix
p193...
Most popular screen sizes/resolutions on Android phones [closed]
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You can see the resolutions for those categories in the Table 2, in this section: http://develop...
App Inventor 2 数据可视化教程 - 折线图/曲线图/实时数据绘图 · App Inventor 2 中文网
...图表类型
三、快速上手：第一个折线图
3.1 界面设计
3.2 积木块：添加静态数据
3.3 用 CSV 方式一次性导入数据
四、实时数据绘图（动态折线图）
4.1 使用计时器定时添加数据
4.2 保持图...
Regular expression to match numbers with or without commas and decimals in text
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