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常用Linux命令详解(持续更新) - 更多技术 - 清泛网 - 专注C/C++及内核技术

...h;ntpl 命令可以查看系统端口及IP的绑定情况。 13.查看操作系统版本及位数(32位或64位) uname -a 命令可以查看Linux系统内核版本及系统位数(i386:32位,x86_64:64位)。 (清泛网会对此文进行持续整理、改进。) Linux 命...
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Adding HTML entities using CSS content

...ppend an image, use "background-image" and display:inline-block; and width:123px; height:123px; (use exact width/height) – Nathan J.B. Oct 10 '13 at 4:42  |...
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ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...地找出和判断ros的运行状态,调试信息是非常重要的。从操作系统得到默认的调试输出很容易,但是这些输出对于定位问题尤其是bugs没有太大作用。 本文旨在告诉读者如何生成有用的调试信息,通过这些信息可以直接判断出操...
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MFC子窗口和父窗口(SetParent,SetOwner) - C/C++ - 清泛网 - 专注C/C++及内核技术

MFC子窗口和父窗口(SetParent,SetOwner)在windows系统中,每个窗口对象都对应有一个数据结构,形成一个list链表。系统的窗口管理器通过这个list来获取窗口信息和管理每个窗口。一、概念和区别 在windows系统中,每个窗口对象都对...
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How to check if a String is numeric in Java

... @kape123 :) sure "123.456" doesn´t contain digits. – Ahmed Alejo Nov 14 '14 at 18:01 8 ...
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Pad a string with leading zeros so it's 3 characters long in SQL Server 2008

...technique for left-padding to any desired width: declare @x int = 123 -- value to be padded declare @width int = 25 -- desired width declare @pad char(1) = '0' -- pad character select right_justified = replicate( @pad , @width-le...
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How do I create a readable diff of two spreadsheets using git diff?

...sxd OpenOffice.org .odt/.ods/.odp/.odg Open Document .wj2/wj3/wk3/wk4/123 Lotus 123 .wri Windows3.1 Write .pdf Adobe PDF .mht Web Archive .eml Exported files from OutlookExpress Regard, Andres share ...
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苹果全球开发者大会:无硬件 iOS 9等三大系统更新 - 资讯 - 清泛网 - 专注C...

...进行了提升。新版系统中加入了分屏模式,可以进行跨屏操作;新的手势功能可以让很多快速操作更为简单,比如从邮件APP里删除某封邮件;Safari上加入 了固定标签页、网页静音等小功能。Craig Federighi还宣布El Capitan将于今秋免...
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curl json post request via terminal to a rails app

...firstname","last_name":"lastname","email":"email@email.com","password":"app123","password_confirmation":"app123"}}' \ http://localhost:3000/api/1/users share | improve this answer | ...
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Determine the data types of a data frame's columns

...7.6, 167.6... $ hp <dbl> 110, 110, 93, 110, 175, 105, 245, 62, 95, 123, 123, 180, 180, 180, 205, 215... $ drat <dbl> 3.90, 3.90, 3.85, 3.08, 3.15, 2.76, 3.21, 3.69, 3.92, 3.92, 3.92, 3.07, 3.0... $ wt <dbl> 2.620, 2.875, 2.320, 3.215, 3.440, 3.460, 3.570, 3.190, 3.150, 3.440, 3...