Linux

Sometimes, we need to concatenate the data obtained from different fields. Each database provides a way to achieve this: Mysql:concat () Oracle:concat (), | | SQL Server: + The syntax for CONCAT ()

Linux Task (Jobs) detailedAfter executing a command with the administrator, the command is moved to the background with CTRL + Z. Causes the root cannot be exited.Input command: ExitTerminal display: There is stopped jobs.Workaround:Method One,

directive: SCPCopying files between different Linux hostsFile copy with security, SSH-based login.Some Linux distributions do not have their own SCP, so you need to install SCP# yum-y Install openssh-clientsBasic syntax:# SCP [parameter] source

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First, SendMail installation Under CentOS, SendMail is typically installed with the operating system by default. If the SendMail service is not installed when the system is installed, manually installing SendMail is also simple: # yum Install-y

I. Concept:The time in a Linux system is divided into system time and hardware time:System time refers to the time in the Linux kernel;Hardware time refers to the time that is calculated by the hardware clock on the motherboard. Different times, the

Highly available clustersI. What is a highly available clusterA highly available cluster is when one node or server fails, another node automatically and immediately provides services, and the resources on the failed node are transferred to another

Linux containers,linux containers, containers, it can be imagined as a large jar of things, the jar mouth is large, it can be installed in many of the same shape, but small jars of different sizes. Professional words, called a container-based

As we all know, with the increase of the number of hosts on the Internet, the existing 32-bit IP address is not enough, so the introduction of the next generation of IP address IPv6, write network program to slightly change the existing network

Experiment one: The VI editor mode switch 1.       Experimental goal: Master VI editor Three modes of switching and its characteristics 2. Experimental procedure: Step one: Enter the VI editor, which is the command modeEnter VI or VIM in the command

Recording screen:In Linux commonly used recorder screen tool has 5 kinds, can Baidu or Google under Oh, I choose is recordmydesktop, use is very convenient, the time to pay attention to the number of frames per second high, otherwise the effect is

When it comes to VM password issues on Windows Azure, our first two articles have described how to reset the login account password for Windows VMS, Linux VMS on Windows Azure. Today, in addition to the above two methods, there is a way to retrieve

Use APT-mirror to configure the Ubuntu local software repository in four steps Today, we will show you how to configure the local software repository directly through the official Ubuntu software repository on your Ubuntu PC or Ubuntu server.

Bash script skills-trap Command, bash script-trap Share a shell script technique. When you write a shell script, you generally only ensure that the function is available, but the program is not very robust and not robust enough. Most of them are

How to install Bugzilla 4.4 on Ubuntu/CentOS 6. x Here we will show you how to install Bugzilla on a Ubuntu 14.04 or CentOS 6.5/7. Bugzilla is a web-based bug tracking software used to track defect databases. It is also a free and open-source

Install and configure Squid Proxy Server in CentOS 6.4 I. Introduction The Proxy Server stands for Proxy Server. Its function is to obtain network information from the Proxy network user. Squid is a software used to cache Internet data. It receives

Use backup-manager for system backup on Linux Whether simple or not, we have the opportunity to understand the importance of backup. Considering that the backup method is really versatile, you may want to know how to effectively select the right

Installation and Application of Mac OS X Server Mac OS X Server is the new generation Server software of Apple Computer. Designed for OS x, iOS devices, and Mac OS X, Mavericks is now supported to easily share files, schedule meetings, synchronize

Install hadoop in Centos and connect to Eclipse Hadoop has been planned for a long time and has not been put on the agenda until recently. It took some time to build hadoop under centos. The "setbacks" that we experienced before and after can

Use iSCSI Target to create centralized security storage (1) ISCSI is a block-level protocol used to share original storage devices through TCP/IP networks, you can use an existing IP address and ethernet address, such as a nic, vswitch, or vro, to