Linux

Linux Time Line System V and BSD in the 80 's copyright dispute 1990 BSD transplant to X86 386 plan aborted 1991 Finnish Linus invented Linux 1994 Linux1.0 released for use in production environments Operating systemOS =

sudo 以另一个用户身份执行命令Syntax format: sudo "option" sudo [options]Note: There must be at least one space between each element in the sudo command and subsequent options and filesParameter options:-L, which lists the commands that the current user can

The minimization principle is extremely important for Linux system security, that is, more than a few things, including the following aspects: Install the Linux system minimized, that is, the package is minimized, yum installation package

1. Modify the host name:Under root account, use the command: vi/etc/sysconfig/networkor sudo vi/etc/sysconfig/network2. Set the system default boot levelEnter the Vi/etc/inittab level in the root account to change to 3Each start-level representative

Ubuntu supports multi-user login, so mastering multi-user-created techniques can save a lot of thingsUseradd specific approach to see man adduser1. Create user,-m to create user home directory at the same timesudo useradd-m Hadoop2. Set the password

Zabbix Application ExamplesAdd a custom monitoring itemLet's take an example: monitor the number of concurrent connections on a Web server 80 port and set up a graph.1. Write a script that can crawl the data and create a script on the client

Crond is a command that Linux uses to execute programs on a regular basis. This task Dispatch command is started by default when the operating system is installed. The Crond command periodically checks to see if there is any work to be done and the

1, the concept of dynamic library . Dynamic link library compared with ordinary programs, there is no main function, which is a series of functions . Production of so dynamic link library files through shared and fpic compilation parameters. When

is because the Linux firewall is not open 8080 portsWorkaround:/sbin/iptables-i input-p TCP--dport 8080-j accept #开启8080端口/sbin/iptables-i input-p TCP--dport 22-j accept #开启22端 Port/etc/rc.d/init.d/iptables Save #保存配置/etc/rc.d/init.d/iptables

1. View versionlsb_release -a2. View MySQL PathWhereis MySQL3. View the EncodingLocale4. Install FTPInstallationYum install-y vsftpd//InstallationSystemctl start Vsftpd.service//Start VSFTPD ServiceFTP Permissions configuration:The configuration

When testing with the Windows platform, it is affected by network conditions, resulting in inaccurate test results, especially in cases of high concurrency, requiring accurate response time for test requests, which is more demanding for the network.

1. All of a sudden, all the commands don't work.The reason is simple, the configuration file is wrong, the command is from path, path has a problem, can not find almost all the commandsThe most troublesome thing is knowing that path may be wrong,

1.useradd Add user-G first Group-G-Time group-D specified directory-p (passwd) password-u (UID)2.userdel Delete UserUsage: # useradd xiaodandan-g xiaodaodan-p 111111 explanation Create a new user Xiaodandan, user group is Xiaodandan, password 6

1.tar Unzip what problemUser User groups2. What is the search for XXX command?Find/-name XXX3. We execute the order, actually go to which variable to findPATH4. Talk about the parameters of the big R commandChown chmod5. Talk about small R

Learning content: Intermediate: System Foundation, System management, network security and network services, shell scriptingAdvanced: MySQL database, clustering, distributed systems and virtualization technologies: XEN,KVM, operation and maintenance

Description, this article for me to learn Monensin Teacher's Linux kernel lesson of a little summary, and as a class homework.Has highlighted, "Linux kernel Analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000First, the preparation:

1.f:\movies\ School Big Data Weekend class original (Wisdom Big Data third phase): the course is quite chaotic, in order to learn it1.linux Foundation: It turns out that Linux is useless. Be sure to install a virtual machine. 2018-05-27 Open.The

shortcut Keys Description CTRL + A Switch to command line start Ctrl+e Switch to the end of the command line CTRL + C Terminates the current command or script

Modified from the system command line, non-CRT1. Command line input echo $PS 1Output PS1Explanation: Current account name, host first name, full directory2. Color formatting [[\E]F;BM]3. Enter ps1= ' [[\e[35;40m]\u[[\e[31;40m]\h[[e[36;40m]\$ '] in

Dash + Alfredhttps://www.jianshu.com/p/77d2bf8df81fFor programmers, viewing the API documentation is very frequent, and switching between the regular Windows is cumbersome, and there is a document-checking artifact on the Mac: Dash.Detailed use can