prefix | 易学教程

How to remove filename prefix with a Posix shell

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问题 How can I remove the filename prefix in Bash as in the following example: XY TD-11212239.pdf to get 11212239.pdf i.e, remove XY TD- ? 回答1: You have given very little information, but assuming you are doing this in bash, and have a list of files whose prefix needs to be removed, you can pipe the list through sed : For example: ./generate_your_list_of_files | sed -e 's/^prefix//' or if your list of files are space separated: echo TD-file1 TD-file2.x.yt TD-file3-beep | sed -e 's/\<TD-//g' The

targetNamespace and xmlns without prefix, what is the difference?

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问题 In an xml schema document, if I have both the targetNamespace and the xmlns without a prefix . <xsd:schema xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" targetNamespace=\"http://example.com/\" xmlns=\"http://example.com/\"> What is the exact difference between them? My comprehension is that if you have an xmlns without a prefix, all elements without prefix gets that namespace and...confusingly the same goes for targetNamespace. 回答1: targetNamespace is an XML Schema "artifact"; its purpose:

VScode 之快速创建vue模板

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1. 插件库中搜索Vetur安装，识别vue文件 2. 新建代码片段 > 文件-->首选项-->用户代码片段-->点击新建代码片段--取名vue.json 确定 3. 在json文件中添加自己的模板字段 { // Place your snippets for vue here. Each snippet is defined under a snippet name and has a prefix, body and // description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are: // $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the // same ids are connected. // Example: // "Print to console": { // "prefix": "log", // "body": [ // "console.log('$1');", //

Add a prefix to each item of a PHP array

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问题 I have a PHP array of numbers, which I would like to prefix with a minus (-). I think through the use of explode and implode it would be possible but my knowledge of php is not possible to actually do it. Any help would be appreciated. Essentially I would like to go from this: $array = [1, 2, 3, 4, 5]; to this: $array = [-1, -2, -3, -4, -5]; Any ideas? 回答1: Simple: foreach ($array as &$value) { $value *= (-1); } unset($value); Unless the array is a string: foreach ($array as &$value) { $value

Python regex - r prefix

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问题 Can anyone explain why example 1 below works, when the r prefix is not used? I thought the r prefix must be used whenever escape sequences are used. Example 2 and example 3 demonstrate this. # example 1 import re print (re.sub(\'\\s+\', \' \', \'hello there there\')) # prints \'hello there there\' - not expected as r prefix is not used # example 2 import re print (re.sub(r\'(\\b\\w+)(\\s+\\1\\b)+\', r\'\\1\', \'hello there there\')) # prints \'hello there\' - as expected as r prefix is used #

IPv6系列-详解自动分配IPv6地址

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深入研究自动分配IPv6地址的Stateless(无状态)与Stateful(有状态)方式小慢哥的原创文章，欢迎转载目录 ▪ 一. Link-Local Address的生成方式 ▪ 二. Global Address的生成方式 ▪ 三. RA报文中3个关键的Flag ▪ 四. 流程示意图 ▪ 五. 测试获得IP效果 ▪ 六. 应用场景（选择无状态还是有状态） ▪ 七. 后续内容 ▪ 附. 参考文档一. Link-Local Address的生成方式生成“链路本地地址”，有2种方式 ▷ 手动配置 ▷ 自动配置其中“自动配置”根据算法，又分为 ▷ eui64：根据mac地址换算而来 ▷ stable_secret：跟随网络环境的变化而变化，处于固定网络环境时其值将固定 ▷ random：随机生成二. Global Address的生成方式生成“全球单播地址”（或者“唯一本地地址”），有2种方式 ▷ 手动配置 ▷ 自动配置其中“自动配置”根据获取方式，又分为 ▷ 无状态（Stateless）：根据路由通告报文RA（Router Advertisement）包含的prefix前缀信息自动配置IPv6地址，组成方式是Prefix + (EUI64 or 随机)。Stateless也可以称为SLAAC（Stateless address autoconfiguration）