linux foundation certs

pass: globbing *: Any character of any length?: any single character[^]: matches any single character outside the specified range of characters such as: [^0-9][]: matches any single character within the specified range[: Space:]: white space character[:p UNCT:]: Punctuation[: Lower:]: lowercase letters[: Upper:]: Uppercase[: Alpha:]: Uppercase and lowercase letters[:d igit:]: Number[: Alnum:]: Numbers and uppercase and lowercase letters This article is from the "Wind

-i.bak ' S#ZH_CN. Utf-8#zh_cn. Utf-8#g '/etc/sysconfig/i18n[Email protected] ~]# #备份i180文件再修改[[Email protected] ~] #source/etc/sysconfig/i18n############################################################Vim operationC caps The contents of the cursor to the end of the line to delete and enter the edit mode[email protected] ~] #chkconfig #管理开机启动Reboot restarting the serverShutdown Shutdown/Restart-R Restart-H shutdown-C Cancel current shutdown and restartESC + .Summarize:1. Display system version ad

: Linuxnginxmysqlphpnagios most of the Linux operations Engineers, network engineers, system engineers are at this stage. At this stage the average wage is 3-10k. The partners at this stage should pay attention. It belongs to the bottom of the pyramid, and the salary is relatively low.02. System Architecture Level: This stage is a large-scale clustering scheme with known software architecture and implementation of various technical solutions This is c

contents of the scheduled task on the editor and save the Exit3. Use Crontab-l to view the list4.cat/var/log/cron/the user to see if the content was compiled successfully0 1 * * 7 oracle/backup.shKernel:1 briefly describe the functionality of the kernel.1. Pass the application request to the hardware2. Can be a separate kernel module2 How can I permanently modify the kernel parameters without rebooting the system?1. Use the SYSCTL command to display all available values2. Edit with the VI comma

Learn about Linux, please refer to the book "Linux should Learn"Seattle, linuxcon/containercon/cloudopen,2015 August 17 –linux Foundation, a nonprofit organization dedicated to the development of Linux and collaborative development, today announced that Huawei is officially

1) This article is dedicated to people who insist on self-studyI converted from network management to a Linux OPS engineer and summed up some experience. Write him out in the hope that he can help more people.2) This article introduces the basic theory of Shell programming in LinuxWhat is a shell script?The shell is a shell of a Linux system that allows users to implement functions through its operating sys

using YumYum–y Install software name2, master using Yum to remove softwareYum–y Remove software Name3, mastering the use of Yum installation componentsYum–y Groupinstall Component Name4, mastering the use of Yum to remove componentsYum–y Groupremove Component Name5, Master clear Yum CacheYum Clean All6, use Yum to find packagesYum Search7, mastering the configuration of YumYum configuration generally has two ways, one is to configure the yum.conf file in the/etc directory directly, and the othe

$ The value that is used to invoke the variable, such as when the value of the variable name needs to be called, the value of the variable needs to be $name \ The escape character, followed by a special symbol after \ will lose its special meaning and become a normal character. such as \$ will output the "$" symbol, not as a variable reference 7) wildcard characters Wildcard characters Role ？ Match an arbitrary

;-C $file: Whether it exists and is a character device file;-S $file: exists and is a socket file;-P $file: exists and is a pipe file;-R $file: Whether the current user has read access to the file;-W $file: Whether the current user has write access to the file;-X $file: Whether the current user has execute permission on the file;-U $file: Whether the file has suid permissions;-G $file: Whether the file has Sgid permissions;-K $file: Whether the file has sticky permissions;-O $file: Whether the c

]/]# CD ~wangwu go to Wangwu home directory[Email protected] wangwu]# Ls/homeLisi Wangwu Zhangsancp-replicationFormat: CP [option] source file destination PathCommon Command options:-R Recursive replication directory must have this option-P Keep the permissions modification time of source files and other properties unchangedFor example:[[email protected]/]# cp-r/boot//opt/copy/boot to/opt[Email protected]/]# ls/opt/1.txt 2.txt a Bootrm-DeleteFormat: RM [options] File or directory-R Recursive Del

completes the process number isolation, and also adds the Clone_newpid parameter to clone (), such as:int container_pid = clone(container_main, container_stack + STACK_SIZE, SIGCHLD | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWPID, NULL);The effect is as follows, the Echo $$ output the PID number of the shell, has changed.But there are no changes to commands like Ps/top:For specific reasons and what's next (including Mount Namespace,network namespace and user namespace), you can focus on my public

Linux System Foundation tuning1. turn off SELinux and empty iptablesSed-i ' s/selinux=enforcing/selinux=disabled/g '/etc/selinux/configgrep selinux=disabled/etc/selinux/ Configsetenforce 0iptables-fiptables-xiptables-ziptables-l/etc/init.d/iptables Save2. Add a regular user and perform sudo authorization managementUseradd liwenecho ' 123456 ' |passwd--stdin liwenhistory-cecho ' Liwen all= (All) Nopasswd:a

Package1 [Package2] [...]* repolist [all|enabled|disabled] list all available warehouses that have been configured* Version [all | installed | available | group-* | nogroups* |grouplist | groupinfo]*history[info|list|packages-list|packages-info|summary|addon-info|redo|undo|rollback|new|sync|stats]* Load-transaction [Txfile]* Check* Help [command]Yum available options for the command:- y: The auto answer is " Yes "--disablerepo=: temporarily disables a file that is configured and enabled in the

In the past 20 years, Windows systems have dominated the world in the consumer market. However, as new products such as handheld devices and Smart Home Appliances emerge one after another, Linux is widely used. After the emergence of Android and MeeGo, this change is accelerating. "In the future, we will be eliminated without using Linux ." Said Jim Zemlin, CEO of the L