用perl在多个文件中替换

用perl在多个文件中替换
perl -pi -w -e 's/search/replace/g;' *.cpp

e.g.

perl -pi -w -e 's/.C>/.cpp>/g;' jni/ga/*

iphone

From Core Data Programming Guide

You are discouraged from overriding description—if this method fires a fault during a debugging operation, the results may be unpredictable—and initWithEntity:insertIntoManagedObjectContext:. You should typically not override the key-value coding methods such as valueForKey: and setValue:forKeyPath:.

何处落尘埃

身如菩提树，心如明镜台，时时勤拂拭，不使留尘埃。
菩提本非树，明镜亦非台，本来无一物，何处落尘埃。

enable auto spellcheck in Firefox

Type about:config in address bar, enter

Click on "I'll be careful, I promise!",

Type layout.spellcheckDefault on Filter,

Change the default value from 1 to 2.

javascript event 事件

属性	当以下情况发生时，出现此事件	FF	N	IE
onabort	图像加载被中断	1	3	4
onblur	元素失去焦点	1	2	3
onchange	用户改变域的内容	1	2	3
onclick	鼠标点击某个对象	1	2	3
ondblclick	鼠标双击某个对象	1	4	4
onerror	当加载文档或图像时发生某个错误	1	3	4
onfocus	元素获得焦点	1	2	3
onkeydown	某个键盘的键被按下	1	4	3
onkeypress	某个键盘的键被按下或按住	1	4	3
onkeyup	某个键盘的键被松开	1	4	3
onload	某个页面或图像被完成加载	1	2	3
onmousedown	某个鼠标按键被按下	1	4	4
onmousemove	鼠标被移动	1	6	3
onmouseout	鼠标从某元素移开	1	4	4
onmouseover	鼠标被移到某元素之上	1	2	3
onmouseup	某个鼠标按键被松开	1	4	4
onreset	重置按钮被点击	1	3	4
onresize	窗口或框架被调整尺寸	1	4	4
onselect	文本被选定	1	2	3
onsubmit	提交按钮被点击	1	2	3
onunload	用户退出页面	1	2	3

origin: http://www.w3school.com.cn/js/jsref_events.asp

java String[], array of String

in java one can return multi variables by return an array of String, String[]

public String[] foo(){
    String[] resultSrtArr = new String[2];    
    resultStrArr[0] = Integer.toString( 321 );
    resultStrArr[1] = "result";
    return resultSrtArr;
}

public toCallFoo(){
    String[] resultSrtArr = foo();
    int a = Integer.parseInt( resultStrArr[0].trim() );
    String str = resultStrArr[1];
}

Math Fonts in Latex Beamer for Presentation