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Tramp open remote file
M-x /usr@machine:/path/to.file

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autossh -M 20000 -D 8001 root@106.186.28.75 -p 6666
autossh -M 20000 -L 127.0.0.1:8080:127.0.0.1:9050 root@106.186.28.75

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import android.content.Context;  
  
public class DensityUtil {  
  
    /** 
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素) 
     */  
    public static int dip2px(Context context, float dpValue) {  
        final float scale = context.getResources().getDisplayMetrics().density;  
        return (int) (dpValue * scale + 0.5f);  

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[Desktop Entry]
Name=Eclipse
Comment=ANDROID DEV SDK
Encoding=UTF-8
Exec=/usr/local/eclipse/eclipse
Icon=/usr/local/eclipse/icon.xpm
Terminal=false
Type=Application
Categories=Application;Development;

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private final static int clamp(int x, int low, int high) {
    return (x < low) ? low : ((x > high) ? high : x);
}

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(reduce conj '() [1 2 3 4])

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1. 系统安装
2. 网络链接
3. 显卡驱动安装
4. git安装
5. vim安装
6. 中文/输入法安装

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hdiutil convert -format UDRW -o <output-file> <input-iso-file>
diskutil list /dev/disk
diskutil unmountDisk /dev/diskN
dd if=<dmg-file> of=/dev/rdisk1 

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//定义
SEL class_func;

//赋值
@interface foo
   -(int)add:int val;
@end
class_func = @selector(add:int);

//执行

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sudo /Developer/Library/uninstall-devtools --mode=all