现在CPU2核以上比较普遍了,平时用linux上上网可能用不着双核甚至4核,大部分发行版内核都启用了CPU_HOTPLUG,到/sys/devices/system/cpu下可以看到文件夹cpu0.cpu1,除cpu0(这个不能关)每个文件夹下都有一个online文件,往里面写0就可以关闭核心,比如我的T7300,echo '0' >/sys/devices/system/cpu/cpu1/online 就可以关闭第二个核,不影响小型应用.要开启,往里面echo 1就行.这个操作好像要root完…

Linux & terminal color & command line color how to change Linux terminal color https://askubuntu.com/questions/558280/changing-colour-of-text-and-background-of-terminal https://askubuntu.com/a/558422 # 92: Light Green # 107: White (don't use with…

Use telnet command The syntax is:telnet {host} {port}telnet www.cyberciti.biz 80telnet 192.168.2.254 80Sample outputs: Trying 192.168.2.254... Connected to router. Escape character is '^]'. ^] telnet> q Connection closed. To close your session, press…

I passionately enjoy working with commands as they offer more control over a Linux system than GUIs(Graphical User Interfaces) applications, therefore am always on the look out to discover or figure out interesting ways and ideas to make Linux so eas…

1. Maven使用 -D参数名称 将参数传递至所运行项目 Maven指定TestNg.xml文件 clean test -DsuiteXmlFile=src/main/resources/testng.xml Maven指定TestNg的groups clean test -Dgroups=group1,group2 是否跳过测试用例 <skipTests>false</skipTests> 向代码中传递参数 systemPropertyVariables <plugin&…

Notes on The Linux Command Line (by W. E. Shotts Jr.) edited by Gopher 感觉博客园是不是搞了什么CSS在里头--在博客园显示效果挺蛋疼的...这本书相当棒,建议一读 File, file systems and commands ls -a(all) -d(directory) -h(human-readable) less (show file content) FHS /bin: Contains binaries (pr…

Kernel parameter requirements ( Linux DB2) https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.qb.server.doc/doc/c0057140.html You must have root authority to modify kernel parameters. Run the ipcs -l command to list the current…

Linux用户以及权限相关命令 查看身份 id:Display user identity. 这个命令的输出会显示uid,gid和用户所属的组. uid即user ID,这是账户创建时被赋予的. gid是primary group ID,是主要的组的id.当然这个用户也可以属于其他更多的组. 用户账户信息被定义在 /etc/passwd文件中,组信息被定义在/etc/group文件中. chmod 命令名称:chmod 命令英文原意:change the permissions mode of…

Linux Command Line 解析 0 处理模型 Linux kernel的启动包括很多组件的初始化和相关配置,这些配置参数一般是通过command line进行配置的.在进行后续分析之前,先来理解一下command line的处理模型: 要处理的对象是一个字符串,其中包含了各种配置信息,通常各个配置之间通过空格进行分离,每个配置的表达形式是如:param=value1,value2 或者很简单就是一个rw. 那么kernel就需要提供对这些参数进行处理的处理函数列表.根据参数的作用以及…

When you are using Linux command line frequently, using the history effectively can be a major productivity boost. In fact, once you have mastered the 15 examples that I’ve provided here, you’ll find using command line more enjoyable and fun. 1. Disp…