Linux SQL statement Concise tutorial---Primary key, foreign key

primary KEY (Primary key) each of the data in the table is a unique value in the form. In other words, it is a unique way to identify each row of data in a table. The primary key can be a field in the original data, or a man-made field (a field that

Linux Basics (iv)

First, system monitoring 1. Real-time monitoring of CPU, memory and hard disk status with the top commandThe effect is Windows-like Task Manager, which refreshes the display on the screen every 5 seconds by default.[[email protected]/]#TopTop-17:39:4

Linux expect usage

usage1. [#!/usr/bin/expect]This line tells the code in the operating system script to use that Shell to execute. The expect here is actually a kind of thing with bash under Linux and cmd under Windows.Note: This line is required on the first line of

Linux Basic optimization

How to do basic optimization after installing Linux system? 1, Yum Source 2, SELinux3, close firewall 4, thin boot service 5, use sudo to manage files 6, Chinese character set display 7, Time server synchronization 8-9, SSH remote connection 10,

How to set up a Linux server on Amazon AWS

Summary: AWS (Amazon Web Services) is one of the world's leading cloud server providers. You can use the AWS platform to set up your servers within a minute. On AWS, you can fine-tune many of the technical details of the server, such as the number

Usage and difference of Yum and Apt-get in Linux

gpg

Usage and difference of Yum and Apt-get in Linux  Generally famous Linux systems are basically divided into two main categories:  1.redhat series: Redhat, Centos, Fedora  2.debian series: Debian, Ubuntu and other  redhat Series  1 common

Syslog, UNIX domain sockets from a simple requirement to a Linux environment

Demand:Back to TopWorking in a Linux (DEBIAN8) environment to run a server program, implemented in the Python language, the code has different priority logs need to be recorded, the development time is the use of Python logging module output to the

How Linux and Unix install git

Guide The easiest way to install Git on Linux is to use the preferred Package Manager for Linux distributions. If you like to build from source code, you can find tarball on kernel.org. I hope this article is helpful to everyone ~

Linux wildcard characters and regular expressions

Wildcard characters* Any character, can be repeated multiple times? Any character, repeat once[] represents a characterexample: [a,b,c] means any one of the ABCwildcard characters are used to match the file name of theRegular ExpressionsA regular

Linux Learning Note 2

Recommendations for beginners in 2016-09-26 All commands are lowercase, strictly case-insensitive, and do not prefix file types, but we write manually to help identify them. Zip package:. gz/.bz2/.tar.bz2/.tgz binary package:. RPM Web file:.

The difference between the Linux directory file permissions.

The importance of permissions to files R (Read): Can read the actual contents of this file, such as reading the text file content, etc.; Because there is no permission to W, so come in and have readonly message. W (write)

Linux/unix system inter-backup script

This is a shell script I wrote earlier, used to Linux/unix automatic file backups between systems.The main features of the script are: Synchronization or copying of files for the day between different servers; requires expect command

Linux System Bulk Configuration script

System bulk Configuration Script user manual usage requirements Linux operating system (RHEL,kylin, meditation rock available) Local computer expect commands are available ssh, scp commands available Script Composition and

The old driver talking about the learning skills of Linux system

Linux originated in the the 1970s and is an excellent operating system. The first time that Linux was exposed to this system was during college, so it was discovered in addition to the other interesting system outside of Windows. Start with a

15 Useful Linux/unix Tape management instructions

Tape devices should be used only for timed file archives or for transferring data from one server to another. The general tape device is connected to a Unix machine and manipulated with Mt or MTX. It is strongly recommended that you back up all of

Learn some linux-every day Select command cut and grep

Choosing a command is to analyze a piece of data and take out what we want. or by analyzing the keywords, get the line we want! In general, the selection command is usually for a row of data for analysis, not the entire information analysis.CutThe

ACL permissions control under Linux and setting user execution permissions on commands with sudo

ACL permission Assignment1.setfacl command Set file permissionsSetfacl-m U:USER1:RW root.txtsetfacl-m u:user2:rwx root.txt2.getfacl Command View file permissionsGetfacl Root.txt[Email protected] ~]# getfacl text.txt # file:text.txt# owner:root#

Linux Operations Common commands

propos Word displays commands related to WordWhich command displays the full path name of the commandsTime command to calculate when commands runTime Cat starts timing. ctrl-d stop.Nice info runs a low-priority command (here is info)Renice 19-p $$

Howto:linux Server Change OR Setup the Timezone

My Linux Systems TimeZone is pointing to the wrong timezone. How does I Setup or change the timezone under Linux operating systems?Unix time, or POSIX time, is a system for describing points in Time:it is the number of seconds elapsed since midnight

Windows platform is on the sublime edit files on the remote Linux platform

Sublime is a powerful cross-platform code editing tool, not much to say.Want to use sublime to complete the code editing work for the Django website under the Linux platform to improve efficiency (originally using Vim under Linux is less efficient

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