小编jww*_*jww的帖子

我偶尔会运行这样的bash命令行:

n=0; while [[ $n -lt 10 ]]; do some_command; n=$((n+1)); done

some_command连续运行多次 - 在这种情况下为10次.

通常some_command是一系列命令或管道.

有没有更简洁的方法来做到这一点？

我经常发现文件的标题部分一直变得越来越大但它永远不会变小.在源文件的整个生命周期中,类可能已经移动并被重构,很可能有很多#includes不需要在那里再存在.将它们留在那里只会延长编译时间并增加不必要的编译依赖性.试图弄清楚哪些仍然需要可能是相当繁琐的.

是否有某种工具可以检测多余的#include指令并建议哪些可以安全删除？
lint可能这样做吗？

有没有办法在mysql中获取表的列名？用php

我有一个以逗号分隔的id文件.我正在尝试用新行替换逗号.我试过了:

sed 's/,/\n/g' file

但它不起作用.我错过了什么？

这是我的错误:

(mysite)zjm1126@zjm1126-G41MT-S2:~/zjm_test/mysite$ pip install lxml
Downloading/unpacking lxml
  Running setup.py egg_info for package lxml
    Building lxml version 2.3.
    Building without Cython.
    ERROR: /bin/sh: xslt-config: not found

    ** make sure the development packages of libxml2 and libxslt are installed **

    Using build configuration of libxslt
Installing collected packages: lxml
  Running setup.py install for lxml
    Building lxml version 2.3.
    Building without Cython.
    ERROR: /bin/sh: xslt-config: not found

    ** make sure the development packages of libxml2 and libxslt are installed **

    Using build configuration …

如何通过cmake定义预处理器变量？

等效的代码是#define foo.

我不确定密码哈希是如何工作的(将在以后实现),但现在需要创建数据库模式.

我正在考虑将密码限制为4-20个字符,但据我所知,加密后的哈希字符串将具有不同的长度.

那么,如何将这些密码存储在数据库中？

我正在尝试使用自制软件对openssl进行一些更新,但我设法破坏了一切.我现在无法做任何事情,这是我尝试进行捆绑安装时得到的结果:

$ bundle install
/Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in    `require': dlopen(/Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/openssl.bundle, 9): Symbol not found: _SSLv2_client_method (LoadError)
Referenced from: /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/openssl.bundle
Expected in: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
in /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/openssl.bundle - /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/x86_64-darwin13.0/openssl.bundle
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/openssl.rb:17:in `<top (required)>'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/security.rb:11:in `<top (required)>'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/package.rb:43:in `<top (required)>'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/dependency_installer.rb:3:in `<top (required)>'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.6.3/lib/bundler/installer.rb:2:in `<top (required)>'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.6.3/lib/bundler/cli/install.rb:78:in `run'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.6.3/lib/bundler/cli.rb:146:in `install'
    from /Users/asServer/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/bundler-1.6.3/lib/bundler/vendor/thor/command.rb:27:in `run'
    from …

您知道如果您是系统的管理用户,您可以右键单击"说",批处理脚本并以管理员身份运行它而不输入管理员密码吗？

我想知道如何使用PowerShell脚本执行此操作.我不想输入密码; 我只是想模仿右键单击Run As Administrator方法.

到目前为止我读到的所有内容都要求您提供管理员密码.

这是我正在使用的代码:

// create a request
HttpWebRequest request = (HttpWebRequest)
WebRequest.Create(url); request.KeepAlive = false;
request.ProtocolVersion = HttpVersion.Version10;
request.Method = "POST";


// turn our request string into a byte stream
byte[] postBytes = Encoding.UTF8.GetBytes(json);

// this is important - make sure you specify type this way
request.ContentType = "application/json; charset=UTF-8";
request.Accept = "application/json";
request.ContentLength = postBytes.Length;
request.CookieContainer = Cookies;
request.UserAgent = currentUserAgent;
Stream requestStream = request.GetRequestStream();

// now send it
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();

// grab te response and print it out …