Linux

The Linux user layer directly operates GPIOUnder the guidance of an expert, the application layer can operate the GPIO directly, which refers to setting the input and output of the GPIO and the high or low output level. This greatly improves

= = = File io====Linux system IO operations use file descriptors to represent open files, a non-negativeInteger, which is used to refer to all types of open files, including pipelines, FIFO, network socketsWords, terminals, devices and general files.

The Linux user layer directly operates GPIOUnder the guidance of an expert, the application layer can operate the GPIO directly, which refers to setting the input and output of the GPIO and the high or low output level. This greatly improves

The command MV for renaming files or folders under Linux can be renamed, and files or folders can be moved.Example: Renaming directory A to BMV A BExample: Move the/a directory to/b and rename to Cmv/a/b/cIn fact, in the text mode to rename the file

Start the Server1 exception with the following information:[Email protected] bin]#/startserver.sh Server1Admu0116i:tool information is being logged in file/app/websphere/appserver/profiles/appsrv01/logs/server1/startserver.logAdmu3100i:reading

The purpose of the cat command is to connect files or standard input and print. This command is commonly used to display the contents of a file, or to connect several files to display, or to read from a standard input and display it, often in

User demand: Swap space is not enough, need to expand the swapOperation Steps:One: PartitionFdis/dev/sdb #在sdb硬盘上划分一个分区给swapN #创建一个新分区P #创建主分区+2g #给sdb1 2G of spaceT #更改id#swap的id为82W #保存Two: Formatting partitionsMKSWAP/DEV/SDB1 #格式化分区Three: Write

Set the SecureCRT session buffer size, securecrt session When SecureCRT is used, the default number of rows to be rolled back is 500. You can adjust the configuration as follows:1. Enable option-> session Option 2. Configure the buffer in

Use jlink to burn uboot and mini2440uboot on mini2440 First, attach the installation of the jlink DRIVER: Http://download.csdn.net/detail/zzmno1/3776716#comment And the uboot. binfile I

Some suggestions for users who are learning CentOSIntended audienceExperienced in development.Researchers (by their Numrical ).Strong hands-on ability.I'm just curious. I don't recommend that you continue to read Linux.Correct Learning AttitudeLinux

CentOS upgrade Python3.4.31. Download installation package: wget http://www.python.org/ftp/python/3.4.3/Python-3.4.3.tgz2. Unzip installation package: tar-zxvf Python-3.3.0.tgz3. Go to the decompressed Directory: cd Python-3.3.04. Create the

Add a static route in CentOS5.X [Root @ db2 ~] # Route-n // view the route table (ip route can also be viewed) [Root @ db2 ~] # Route add default gw 10.77.50.1 // add default route Gateway [Root @ db2 ~] # Route add-net 10.77.78.0 netmask 255.25

How to Use iptables to block IP addresses in CentOS 1. Install iptables FirewallRun CentOS: yum install iptablesRun apt-get install iptables In Debian/Ubuntu. 2. Clear existing iptables rulesIptables-FIptables-XIptables-Z 3. Open the specified port#

Install svn using yum in CentOS Install svn in yum [root@LAMP1 html]# yum -y install subversionLoaded plugins: fastestmirror, prestoLoading mirror speeds from cached hostfile * base: mirrors.pubyun.com * extras: mirrors.pubyun.com * updates: mirrors.

CentOS5.x kernel Optimization It mainly analyzes the items in/etc/sysctl. conf in detail. All the content is collected and sorted through the network for your convenience. System Optimization items: Kernel. sysrq = 0 # Use the sysrq key combination

Simplified CentOS system environment Optimization Step 1: Delete unnecessary built-in software packages yum remove Deployment_Guide-en-US finger cups-libs cups ypbindyum remove bluez-libs desktop-file-utils ppp rp-pppoe wireless-tools irda-utilsyum

Handle outgoing broadcast packets when CentOS servers are attacked This is the case: a linux server hosted in a certain place suddenly received a phone call from the data center saying that our machine had paralyzed the entire IDC network. External

Common mysql management commands that must be used by administrators in CenOSLog on to mysqlMysql-uroot-plvtao.netRemote LoginMysql-h110.110.110.110-uroot-plvtao.net;Press enter to enter MYSQL. The MYSQL prompt is: mysql>Exit MYSQL command: exit;

CentOS7 deployment of Open Source stepping stone (bastion host) Jumpserver Open source stepping stone (bastion host) Jumpserver Environment CentOS 7x64 disable selinux firewalld Jumpserver: 172.24.0.14 Testserver: 172.24.0.15 1. Deploy ldapserver 1.1

Mysqldump backup and recovery database in CentOSBack up the database firstUseMysqldump-uroot-plvtao database>/home/bak. SQLRestore the backup database.Common source commands for Database ImportGo to the mysql Database Console,For example,