Linux

1 , grep: Searches for text based on patterns and displays lines of text that conform to patternsText Word wildcards regular the expression's meta-character combination to match the criteriagrep ' root '/etc/passwd Search the/etc/passwd file with

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Because of the need to use the Ros (Robot Operating System) robotic operating system, The system is based on Linux system Ubantu14.04, the first installation contact Linux point of Fear, but I know it is not so difficult to get, but also Ubantu14.04,

What does the Linux system consist of?Consists of user space (application +gnu C standard library) and kernel space (System call interface + kernel + Kernel architecture code).What exactly is the Linux kernel? and composition.Seven types of

File Search: Locate file name Locate is through the database search, one day update, the day plus should use UpdateDB, update the database Locate Locate Locate Search background database:/var/lib/mlocate can only be searched by file name, but

Linux system ArchitectureA, ha cluster configuration1. Installing Heartbeat[[email protected] ~]# vim/etc/hosts//Configure hosts10.30.4.146 Master10.30.4.140 slave[Email protected] ~]# RPM-IVH

Chapter NO. 0 Introduction to Computer science Computer: Receiving the user input instruction and data, after processing the data of the central processor and the logical unit, to produce or store the useful information. The composition of the

1, download libevent, and installis: https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gzExtract:TAR-ZXVF libevent-2.0.21-stable.tar.gzInstallation:./configure--prefix=/usr (Specify installation to/usr/local/libevent

1, vmstat--virtual meomory Statistics, can monitor the operating system's memory information, process status, CPU activity, etc., but unable to conduct in-depth analysis of a processVmstat-n means that the output header information is displayed only

For Linux Beginners There are a lot of problems to explore, not exactly according to the book chapters in order to learn, some knowledge and problems are like installing software as a dependency. Just install the Linux system needs to install the

OK, let's move on to the third question. 3: How many different ways to modify hostname? 1:hostname db-server– takes effect immediately after operation (new session takes effect), but changes are lost after the system restarts2:echo db-server

Turn off SELinux (the source of all evils):Temporary entry into force: Setenforce 0Permanent entry: Modify the settings in the/etc/selinux/config file selinux=disabledConfigure the network:Vi/etc/sysconfig/network-scripts/ifcfg-eth0Service Network

1. View the current time zoneDate-r2. Change the current time zoneTzselectThen you will come out with a menu of options and choose the time zone you want to be OK.3. Replace the system time zone filecp/usr/share/zoneinfo/XXX/YYY /etc/localtimeA

1. DFUsed to view the disk space usage of the file system, full name disk free.-H: Display in GB, MB, KB and other formats that are easier for people to read2. DuUsed to view the size of files and directoriesDisplays the subdirectory size and

Install and configure, ldapubuntu14.04Https://help.ubuntu.com/lts/serverguide/openldap-server.htmlIf error occurs in reinstall, try this:"1) sudo apt-get purge slapd 2) sudo apt-get install slapd ldap-utils" You can configure ldap after

Build a python high-performance framework gevent Development Environment on CentOS 6.31. Upgrade python 2.6 to python 2.7.For business needs, upgrade python from 2.6.6 to 2.7.10 before installation. Refer to blog:Http://blog.csdn.net/tao_627/article/

Install mongodb on centous1. Download and decompress the mongodb file. Put the decompressed file under/opt/(store the Directory and install the file as needed)# Wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.0.4.tgz#

Install Tomcat 8 in CentOS Install Tomcat 8 Go to renewal. Put the apache-tomcat-8.0.26.tar.gz file in the/usr/local directory and execute the following script: #cd/usr/localUnzip tar-zxvfapache-tomcat-8.0.26.tar.gz // decompress the compressed

Centos command to view port usageCentos command to view port usage. For example, to view port 80 usage, run the following command: lsof-I tcp: 80 to list all ports: netstat-ntlp1 and enable ports (take port 80 as an example) method

CentOS 7 screen resolution Modification After CentOS 7 is installed, the screen resolution on the terminal interface is very high and difficult to operate. You can only modify the screen resolution. 1. Modify the grub. cfg file CentOS 7 uses grub2