Darwin | 易学教程

Strange behavior of uniq on darwin shells

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问题 I've used 'uniq -d -c file' in many shell scripts on linux machines, and it works. On my MAC (OS X 10.6.7 with developer tools installed) it doesn't seems to work: $ uniq -d -c testfile.txt usage: uniq [-c | -d | -u] [-i] [-f fields] [-s chars] [input [output]] It would be nice if anyone could checks this. 回答1: Well, it's right there in the Usage message. [ -c | -d | -u] means you can use one of those possibilities, not two. Since OSX is based on BSD, you can check that here or, thanks to

Why does host_statistics64() return inconsistent results?

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问题 Why does host_statistics64() in OS X 10.6.8 (I don't know if other versions have this problem) return counts for free, active, inactive, and wired memory that don't add up to the total amount of ram? And why is it missing an inconsistent number of pages? The following output represents the number of pages not classified as free, active, inactive, or wired over ten seconds (sampled roughly once per second). 458 243 153 199 357 140 304 93 181 224 The code that produces the numbers above is:

Detect passcode lock state from Home screen

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问题 I would like to know if there is any way (should be approved on Appstore) to detect when device passcode is activated on Home screen. Basically, my app would like to know those phone events: device screen turn on/off phone lock/unlock (by Auto-Lock setting / press Power button) passcode activate (by Require Passcode setting) As far as I research, I could achieve 1 & 2 by combine Darwin Notification Center & notify_get_state with 4 events: com.apple.springboard.lockstate com.apple.springboard

VMware 12 安装 macOS S 10.12

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1.安装VMware12,这里不讲了. 2.下载macOS S 10.12.3 懒人版安装镜像,后缀名为.cdr： https://pan.baidu.com/s/1bptBH9P 3.在VMware中是没有新建Mac系统选项的,这里需要unlocker208.zip,解压运行里面的win-install.cmd(需要管理员权限),运行过后会在vmware的安装目录多一些文件.其中,unlocker2.08对应的是Mac10.12.3版本. 4.新建虚拟机,选mac,新建完成之后先不要启动虚拟机,否则会出错.需要做些修改： (1) Vmware11之后的版本需用记事本打开虚拟机文件.vmx，本文安装环境为VM12，故在最后面加上如下设置： smc.version = "0" 进行一些虚拟机设置： (1) 硬件，USB控制器，兼容性改为2.0，不然可能在mac里连接不到真机 (2) 选项，增强型虚拟键盘：在可用时使用 (3) 高级，抓取的输入内容：高；收集调试信息：无；勾选禁用页面内存调整 5.将macOS S 10.12.3(16D32).cdr后缀改名为.iso后加载启动进行安装，先设置硬盘： (1) 选中新建的VMWare虚拟盘 (2) 选择“抹掉”选项卡 (3) 输入分区名称 (4) 点击“抹掉”后弹出对话框，再点击“抹掉”即可 (5) 点击完成后就回到原来的安装界面

Why isn't Darwin's strtod thread safe?

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问题 The following test always produces failures or bus errors for me on my Intel Mac Mini. Compiler: uname -a: Darwin vogon13 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 g++ -v: Target: i686-apple-darwin9 Configured with: /var/tmp/gcc/gcc-5493~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=

技术分享 | 如何使用 dbdeployer 快速搭建 MySQL 测试环境

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作者：余振兴一、工具介绍 dbdeployer 是一款十分强大的数据库测试环境部署工具，可实现一键部署不同架构、不同版本的数据库环境。如：MySQL 主从复制、GTID 模式复制、MySQL 组复制(单主模式、多主模式等) 完整的数据库类型支持及版本，可在安装完 dbdeployer 后使用 dbdeployer admin capabilities 命令进行查看，以下是当前已支持数据库及组件类型 Oracle MySQL Percona MySQL MariaDB TiDB MySQL NDB Cluster Percona XtraDB Cluster mysql-shell 本文主要介绍基于 dbdeployer 工具快速搭建 MySQL 测试环境以及 dbdeployer 的基础使用。完整的功能特性以及使用方式可查看 dbdeployer 文档手册，dbdeployer 的文档手册十分详细的介绍了该工具特性及各类使用方式，可查看文末的相关链接。二、工具安装本文以 MacOS 下部署为例，Linux 平台安装部署方式基本类似（该工具不提供 Windows 版本），可访问 https://github.com/datacharmer/dbdeployer/releases 获取最新版 dbdeployer 下载链接，以下内容中 shell> 表示命令行提示符 ```

Why isn't Darwin's strtod thread safe?

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The following test always produces failures or bus errors for me on my Intel Mac Mini. Compiler: uname -a: Darwin vogon13 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 g++ -v: Target: i686-apple-darwin9 Configured with: /var/tmp/gcc/gcc-5493~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=i686-apple-darwin9 --with-arch=apple --with-tune

iPhone Objective-c detect Screen Lock

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I'm new to make iPhone App with Objective-c I want to make the App which sends a notification when iPhone screen is locked(Pressed Lock button) How can I make this app? I'm trying to make it using "applicationWillSuspend", but /*----------------------------------------*/ - (void)applicationWillSuspend { NSLog(@"WillSuspend"); } /*----------------------------------------*/ This code doesn't work I'm not sure when applicationWillSuspend is called Please, give me some knowledge #import "AppDelegate.h" #import <notify.h> @interface AppDelegate () @end @implementation AppDelegate - (BOOL

GMAT句子改错核心句快速突破心得分享

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GMAT语法对于许多人来说是考试难点，因为句子改错不仅需要大量的语法知识，也要求掌握一定的解题技巧。下面小编就为大家整理汇总了一些GMAT语法的解题方法，帮助大家快速定位核心句，突破复合句长难句问题。主谓结构一个句子必须具备一个主谓结构，无论简单句还是复合句，所以大家在分析GMAT句子改错中的复合句时，可以先抓住的就是他的主谓结构。我们用这条原则来判断一段文是否是完整的句子，或仅仅是一个片段。对这条原则的一般应用为：我们判断试题中是不是具备谓语动词即可。这条原则在GMAT语法解题中大有用武之地，考生应认真掌握。例子：Directed by George Wolfe, the Broadway musical Bring in Da Noise, Bring in Da Funk telling how tap dancing evolved from the African American experience in the decades following the Civil War. No error 这道题需将telling改为谓语动词形式，否则整个句子没有动词。逗号原则逗号原则是指逗号不能用来连接两个句子，它只起语气停顿的作用。考生可利用这条原则迅速做出判断，找到问题所在。所以建议大家最好多看一些GMAT语法书或者教学视频。每天训练适量改错真题

Why does host_statistics64() return inconsistent results?

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Why does host_statistics64() in OS X 10.6.8 (I don't know if other versions have this problem) return counts for free, active, inactive, and wired memory that don't add up to the total amount of ram? And why is it missing an inconsistent number of pages? The following output represents the number of pages not classified as free, active, inactive, or wired over ten seconds (sampled roughly once per second). 458 243 153 199 357 140 304 93 181 224 The code that produces the numbers above is: #include <stdio.h> #include <mach/mach.h> #include <mach/vm_statistics.h> #include <sys/types.h> #include

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