learn linux system administration

Common Linux System administration commandsWhoAmI shows the user of the current operation, such as:650) this.width=650; "src=" Http://p3.pstatp.com/large/19210001778d80f7b8c8 "alt=" Linux Learning ~linux System

includes a file system of size 0 blocks -B,--block-size= size block with specified -H,--human-readable file system size in an easy-to-understand format (e.g. 1K 234M 2G) -H,--si similar to-H, but takes 1000 of the time instead of 1024 -I,--inodes displays inode information instead of block usage -K is--block-size=1k -L,--local only displays the native file

simply enters the command man and the name of the command shell will list a complete description.Standard usage:Name of the man commandTo query the description page of the LS command, enter the command: Man lsTo flip through the manual page, you can use the page UP and PAGE DOWN keys, or use the spacebar to turn back one page and use B to flip forward. To exit the manual page, enter the command Q. To search for keywords in the manuals page, enter a command/and keyword or phrase to search for, a

(1) Process management1. Determine the server health status2. View the processA. Viewing all processes in the system: PSExample: PS aux (using BSD OS command format)A show all foreground processesX Show all background processesU shows which user generatedPs-le (using the Linux Standard command format)-L display more detailed information-E Show All processesResult descriptionVSZ: Occupies virtual memory size

80/tcpBased on C/S modelLoading httpd/var/www/html/ETC/HTTPD/CONF/HTTPD.CONF Master configuration fileSELinuxAn access model developed by the U.S. Security ServiceEnableDisabledEnforing: Mandatory mode if our actions violate selinux, force a refusalPermissive: If you violate SELinux, you will only be warned that you can still accessFiles can be set up with permissions called DAC active access controlSELinux mac for files or directories, mandatory access controlTwo important elements related to S

example: useradd-d/home/bird bird2 ---bird2 is the account name,/home/Bird is the main directory of Bird2 -the general user of the system's main directory is generally built in/home/this pathpasswd Set User password -- in Linux, Superuser can use the passwd command to set or modify the user's password for a normal user. Users can also use the command directly to modify their own passwords without having to use the user name after the command. --pa

also useful when creating a RAM disk.Module classLsmodDegree of importance: MediumLists all installed kernel modules.InsmodDegree of importance: MediumForce the installation of a kernel module (instead of using modprobe if possible) must be called as root.RmmodDegree of importance: MediumForces the uninstallation of a kernel module. Must be called as root.ModprobeDegree of importance: MediumThe module loader, in general, is automatically called in the startup script. Must be called as root.Depm

Linux File System administration commandsCommon Commands1. DF command to view the usage of the partitionCommon options-H More Humane-m displays partition usage in megabytesDisplay information:Mounted on: Mount pointFilesystem: The specific hardware name that corresponds to2, du command to view the file/directory size, by default in K unitsCommon options:-H "Human

: Modify which NIC to follow which, only one can be omitted) x.x.x.x/y (M.M.M.M)//modify IP information; x:ip address, Y: Mask length, M: mask. such as =225.225.255.0Shutdown-h now or Poweroff or init 0//shutdown operation.Shutdown-r now or reboot or init 6//restart operation.Shutdown-r +15 ' The system would be rebboted!! '//Send a notification to each user who is currently logged on to the Linux host ' th

Learn linux system monitoring tools 1. Learn linux Make full use of the built-in linux system monitoring tools to quickly and conveniently understand the

management, file management, package management, and other basic automation requirements than tedious manual work. In this scenario, Ruby is very useful. It has a very good library to meet this point. For this article, I assume that the reader has the application knowledge of Ruby. The basic examples provided here use pure Ruby, so can any UNIX-like support in Ruby? System and Windows? Run on. For more advanced Cfruby examples, you need to be able t

Educational Administration Examination System Summary Educational Administration Examination System Summary The educational administration examination has passed several times in the past and has been developed by many teachers, sisters, and students. Establish, debug, t

system table. Can you imagine the complexity of the relationship? To tell the truth, that time really gave me a headache. Every day I repeat students, teachers, classrooms, colleges, and so on. It's really boring. In fact, the root cause of this idea is that I do not have a deep understanding of software development, and I am blindly infatuated with the study of technology. I think that if I discuss this every day and cannot

Use Httpclient to simulate login to the educational administration system developed by Zhengfang software Co., Ltd. I wrote this article in advance, just to share it, there is not only a method to use cookies to log on to the website, but also a method to use random code, I did not reveal my idea of "commercial secrets". I was very easy to learn. I just picked a

Article Title: Learn how to diagnose linux system faults to create a perfect linux system. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications,

, network Linux Resources Basic 90% is based on Redhat Linux, if you encounter any problems during the learning process, search the network, there are thousands of answers to show in front of you.Third: The Red Hat Linux series complements each other: If you first touch Linux, it is recommended that you install Fedora

solution is also very simple, by grasping the package tool, catch the picture of this verification code, and then show in the client, let the user input on it.After the successful landing, we also need a data, is a cookie. Many systems use cookies to identify the user,This is all you need to get sessionid.So we can get the two data by grabbing the package tool and we'll be able to manipulate the system. User name, password SessionId

Dedicated to beginners: How to learn Linux operating systemFirst, choose the appropriate Linux distributionWhen it comes to Linux distributions, there are too many, and maybe no one can give an accurate number, but one thing is thatLinux is becoming more and more prevalent and facing so many

In advance, I write this, just to share, login website not only use cookies this way, there is a method of using random code, and did not divulge the idea of "trade secret", I Caishuxueqian, just standing on the shoulders of giants, picked a small apple ...Bishi ing ...There is a module is to obtain the educational management system within the corresponding school number of student information, and have follow-up operation! Under normal circumstances,

is not to use the first to fall on the paper? So let me say we have to first Kuo, and then have the opportunity of the soldiers to prove that you are Sun Junjun God. seems to be accidentally and brain hole big open the topic with biased ... Well, in retrospect, the most important thing for me to write this essay is to record some of my own mistakes, and to carefully analyze whether my logical thinking is really a problem. To lose in memory that I was also relieved, because the second