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Linux Shell中 if else及大于、小于、等于逻辑表达式写法 - C/C++ - 清泛网...
Linux Shell中 if else及大于、小于、等于逻辑表达式写法本文简要介绍Linux Shell if条件测试语句的写法，如比较字符串、判断文件是否存在及是否可读等，通常用 "[] "来表示条件测试。注意：if [ xxx ] 表达式前后都要...
Separate Back Stack for each tab in Android using Fragments
... questionable thing to do. I can't imagine it resulting in a decent UI -- if the back key is going to do different things depending on the tab I am, especially if the back key also has its normal behavior of closing the entire activity when at the top of the stack... sounds nasty.
If you are tryi...
Fast way to get image dimensions (not filesize)
...t and width of an image in pixels. It should handle at least JPG, PNG and TIFF, but the more the better. I emphasize fast because my images are quite big (up to 250 MB) and it takes soooo long to get the size with ImageMagick's identify because it obviously reads the images as a whole first.
...
Javascript equivalent of Python's zip function
...x may have performance issues at this time, and possibly in the future, so if you use the second answer with variadic arguments, you may want to perf test it.)
Here's a oneliner:
function zip(arrays) {
return arrays[0].map(function(_,i){
return arrays.map(function(array){return array...
Get Substring - everything before certain char
...tring GetUntilOrEmpty(this string text, string stopAt = "-")
{
if (!String.IsNullOrWhiteSpace(text))
{
int charLocation = text.IndexOf(stopAt, StringComparison.Ordinal);
if (charLocation > 0)
{
return text.Substring(0, charL...
js/php判断终端类型：PC访问、手机访问、微信访问 - 更多技术 - 清泛网 - ...
...)(&|$)");
var r = window.location.search.substr(1).match(reg);
if(r!=null)return unescape(r[2]); return null;
}
/* 智能机浏览器版本信息 */
var browser = {
versions: function () {
var u = navigator.userAgent, app = navigator.appVersion;
return { //移动...
Finding all possible permutations of a given string in python
... Return successive r length permutations of elements in the iterable.
If r is not specified or is None, then r defaults to the length of the
iterable and all possible full-length permutations are generated.
Permutations are emitted in lexicographic sort order. So, if the input
iterable...
How do I get the path of a process in Unix / Linux
...
sudo if output is empty, some processes are created by other system users.
– Lun4i
Sep 2 '17 at 5:21
add ...
ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
//创建context，zmq的socket 需要在context上进行创建
if((pCtx = zmq_ctx_new()) == NULL)
{
return 0;
}
//创建zmq socket ，socket目前有6中属性 ，这里使用dealer方式
//具体使用方式请参考zmq官方文档（zmq手册）
if((p...
How to store arrays in MySQL?
... The third table is the link table between Person and Fruit. So if a person has 100 fruits. I need to create 100 rows in the third table, right? Is this efficient?
– tonga
Jun 28 '13 at 19:11
...