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What are the uses of the exec command in shell scripts? [closed]

... without access to the shell. We could change the sign-in program in /etc/passwd, but maybe we want environment setting to be used from start-up files. So, in (say) .profile, the last statement says something like: exec appln-program so now there is no shell to go back to. Even if appln-progr...
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内存管理内幕:动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术

...未被使用的等事情,并且,在调用 malloc 时, 我们要能够定位未被使用的内存块。因此, malloc 返回的每块内存的起始处首先要有这个 结构: 清单 3. 内存控制块结构定义 struct mem_control_block { int is_available; int size; }; 现...
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实战Nginx与PHP(FastCGI)的安装、配置与优化 - 更多技术 - 清泛网 - 专注...

...并发访问的时候,会出现内存泄漏甚至自动重启FastCGI的问题。 Nginx是个轻量级的HTTP server,必须借助第三方的FastCGI处理器才可以对PHP进行解析,因此Nginx+spawn-fcgi的组合也可以实现对PHP的解析,这里不过多讲述。 PHP-FPM也是...
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CDN(内容分发网络)技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...系结构与Web服务器不同,缓存服务器能比Web服务器获得更高的性能,缓存服务器不仅能提高响应速度,节约带宽,对于加速Web服务器,有效减轻源服务器的负荷是非常有效的。 高速缓存服务器(Cache Server)是软硬件高度集成的...
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实战低成本服务器搭建千万级数据采集系统 - 更多技术 - 清泛网 - 专注C/C++...

...评估下来硬件资源不是瓶颈,看下获取数据的接口有什么问题? 1、通过各大微博的搜索api。就比如新浪微博API针对一个服务器IP的请求次数,普通权限限制是一个小时1w次,最高权限合作授权一个小时4w次。使用应用时还需...
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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...x 177 的正方形。 下面我们看看一个二维码的样例: 定位图案 Position Detection Pattern是定位图案,用于标记二维码的矩形大小。这三个定位图案有白边叫Separators for Postion Detection Patterns。之所以三个而不是四个意思就是三个...
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Can you run GUI applications in a Docker container?

... xvfb firefox RUN mkdir ~/.vnc # Setup a password RUN x11vnc -storepasswd 1234 ~/.vnc/passwd # Autostart firefox (might not be the best way to do it, but it does the trick) RUN bash -c 'echo "firefox" >> /.bashrc' This will create a Docker container running VNC with the password ...
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send/post xml file using curl command line

...o the server, where 'password' is the name of the form-field to which /etc/passwd will be the input: curl -F password=@/etc/passwd www.mypasswords.com So in your case, this would be something like curl -F file=@/some/file/on/your/local/disk http://localhost:8080 ...
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术

...Push-Pull机制的数据更新机制,在一些对数据实时性要求较高的场合,比如直播比赛得分,实时天气预报,交易所实时行情等方面用的很多。并且通过RTD的这种机制我们可以在此基础上实现异步的UDF函数,即当请求发进来的时候,...
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How do I execute any command editing its file (argument) “in place” using bash?

... sponge(1), which lets you do things like this: % sed "s/root/toor/" /etc/passwd | grep -v joey | sponge /etc/passwd However, sponge suffers from the same problem Steve Jessop comments on here. If any of the commands in the pipeline before sponge fail, then the original file will be written over...