Linux

Brief [Root@b etc]# useradd-d/home/wwwroot-m testadmin[Root@b etc]# passwd testadmin[Root@b etc]# chown testadmin-r/home/wwwroot[Root@b etc]# chown-r Testadmin:testadmin/home/wwwroot[Root@b etc]# chmod 760/home/wwwroot[Root@b etc]# su

The SCP is secure copy, a command that is used to remotely copy files under a Linux system. The CP command is similar to it, but the CP is only copied on the local computer and not across the server, and the SCP transport is encrypted.Cp-is mainly

1. Whether the query is installed: Rpm-qa|grep cron 2. Install Crontab: [Root@centos ~]# Yum Install Vixie-cron [Root@centos ~]# Yum Install Crontabs Description Vixie-cron packages are Cron's main programs; The Crontabs package is a program used to

... XFRM FrameworkIPSec is implemented based on the XFRM (read as "transform") framework derived from the Usagi project, which aims to provide a product IPv6 and IPSec protocol stack. The term "transform" refers to forwarding a direction message or

Recently looking at a book on Javaweb implementation of the Web site distributed architecture, it mentions that through load balancing, you can avoid issues such as server paralysis caused by massive access or the inability of users to access due to

First through the physical terminal into Linux, Manual Check ssh found not running #/etc/init.d/sshd Status sshd is stopped The service was manually started and the report permissions error was found. #/etc/init.d/sshd Start starting

Task:display current BASH prompt (PS1) Use the echo command to display current BASH prompt:$ echo $PS 1Sample outputs: [\\u@\h \\w]\\$ This is another output from my Debian based system:$ echo $PS 1Sample outputs: \[\e]0;\u@\h:

1 Introduction to the Inode Understand the inode, from the file storage. The file is stored on the hard disk and the smallest storage unit of the hard disk is called a "sector" (sector). Each sector stores 512 bytes (equivalent to 0.5KB). When the

the source Insight http://rogerer.javaeye.com/blog/755346 under Linux See a friend on the internet wrote a recommended Linux code reading tool source Insight. I would like to refine it, also make notes to facilitate future use. The method is: Wine +

http://blog.csdn.net/zjl_1026_2001/article/details/6587320 Everyone has a different approach to determining whether a file exists. I usually take two approaches: open and access;There are similarities and differences between the two methods, and

1. Principle Explanation The Linux kernel uses a memory paging model that applies to both 32-bit and 64-bit systems, and two-level page tables are sufficient for 32-bit systems, and four-level page tables are used in the x86_64 system, as shown in

General new application of the server, did not open 3306 port, anyway, I met, to use Navicat to connect to the Linux database, all must fill in two places of information, in order to link success.If you want to connect to the database only by

UseCP can also create shortcuts in addition to the copy function Full NameCP is all called copy Parameters-A: equivalent to specifying parameters at the same time PDR -D: If the file is a link file's property (link files), the linked file property

1. Application scenario, build Sam shared directoryAvailable for Linux and between Windows 2. Server ip:192.168.56.11 (A)Client ip:192.168.56.133 (B) View firewall status and close[[email protected] ~]#systemctl status

1th. What is a regular expression Regular expressions are a set of rules and methods that are defined to handle a large number of text | strings By defining the assistance of these special symbols, the system administrator can quickly

Before discussing disk and file system management, we have a simple understanding of the following disk structure: 1) platters, that is, the portion of the recording data, the number of the same as the number of heads, 2) the head, read and write

First, when installing 2 tomcat on a server, modify the port number of the Server.xml file in the second Tomcat's Conf directory (original 8080 to 8081, original 8005 to 8006) can be up to two tomcat can be started and the port does not conflict

Linux 16th Day Self-study package management Time: 20180802DirectoryLinux Package ManagementRPM Package Management tool usesYum Online Package management toolSource Code Compilation InstallerLinux Package ManagementMost of the software on Linux is

One CPU performance monitoring Tool 1 Vmstat, System comes withProcs columns:R column: Indicates the number of processes running and waiting for the CPU time slice, if this value is longer than the number of system CPU cores, indicating that the CPU

1 Understanding Automation operation and MaintenanceTraditional operation and maintenance efficiency is low, most of the work is done artificiallyTraditional operation is cumbersome and error-proneTraditional operations repeat the same thing every