Linux

printf "%-5s%-10s%-4s\n" No Name Markprintf "%-5s%-10s%-4.2f\n" 1 Sarath 80.3456%-5s well-known a string substitution with a format of left-aligned and a width of 5 (-left justified)Pgrep-f WeChat to find the PID with WeChatvar= "Hello"echo $var and

Server 1-----SSH#终于开始记录总结服务器了, because often used to sshd, is also a relatively simple server, learning is also easy, so organized into a blog, there are questions to point out OHOne: Related knowledge interpretationLet's talk about SSH and sshd:SSH

1, modify the user process can open the number of files limitOn a Linux platform, regardless of whether you write a client or a service-side program, the highest concurrency is limited by the number of files that can be opened by the system at the

SSH configurationHost a:10.0.5.199Host b:10.0.5.198Need to configure host a without password logon host A, Host BFirst make sure that all hosts ' firewalls are turned off.On host A, perform the following:1. $CD ~/.ssh2. $ssh-keygen-t RSA-------------

Games, Office, security, can be summed up as the convenience of modern people in life, we are mostly users of these services, and the integration of individual functions that must talk about the Internet, naturally through the Internet to send

Deploy a CentOS system on virtual machine VMware these days toInternal NetworkingInstall the necessary software with the Yum command, but have not been able to static address networking, today finally found a way to set up the CentOS internal IP,

Linux user accounts are divided into: Super User root (uid 0) Normal User (UID 500 and above) Program User (UID 1-499)Group account:Basic Group (Private group) Additional groups (public groups)/etc/passwdSave the user name, host directory, login

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/4B/47/wKioL1QpCXmgNcaaAAJDcDQGPKI756.jpg "alt=" Wkiol1qpcxmgncaaaajdcdqgpki756.jpg "/>Problem Description:1, the system is unable to read and write the disk (TOUCH,CP,CHMOD) and so on2. The

Command substitution: $ (commands), ' command 'Touch./file-$ (date +%f-%h-%m_%s). txtThere are three types of quotes supported by bash:": Command substitution"": weak reference, can implement variable substitution': Strong reference, do not complete

Virtualization ofHardware virtualization:One physical machine virtual out of multiple logical computersCPU, memory can be allocated to multiple virtual machinesSoftware Virtualization:A lamp platform supports multiple websitesDesktop Virtualization..

Directory/File Management　　Directory Management:1.ls2.cd3.pwd4.tree: Viewing the directory tree5.mkdir: Create an empty directory-P: Create parent Directory-V: Show the process of creation　　　　Command line expansion:Mkdir-pv/mnt/test/{x/m,y} #

When you start the shell, it runs the startup file to initialize itself. Which file to run depends on how the shell interacts with a login shell or a non-landing shell (for example, through bash) or a non-interactive shell (to execute shell scripts).

－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－1. UnameThe uname command is used to print information about the current system (kernel version number, hardware architecture, host name, operating system type, etc.)-A or-all: Displays all

The Linux system installs the memcached, first installs the Libevent library.sudo apt-get install libevent libevent- Automatic download installation (Ubuntu/Debian)yum Install Libevent libevent- Automatic download installation (Redhat/Fedora/Centos)

1. Login to the virtual machine via vagrant SSH2. Install Docker through the Yum command in the virtual machine3. Check Docker installation success with docker-v4. Open The Docker acceleratorCurl-ssl Https://get.daocloud.io/daotools/set_mirror. sh |

This paper briefly introduces the following file system and its operation (DF command), disk partitioning, formatting, and most notably Mount operations. Here to "mount" to do a description, we all know that the file system is created on the

Clusters, such as buying a generation to push the server down and put a piece he's quite a cluster, and load balancing is to get this big bunch of servers to work on average. He is called load Balancer, as shown in:For example, I use 192.168.8.155

We encounter a lot of problems when using thinkphp in Nginx, such as:No permissions, this is the benefit of Linux Rights Management, we give him permission.We give him permission to access the normal:Then we add a lists method for the

Add a hard disk to the virtual machine to back up the information for the MBRFdisk-l See if the hard drive system knowsFdisk/dev/sdb to PartitionFdisk-l See if the partition is outMkfs-t EXT4/DEV/SBD1 for formattingMkdir/backupMount/dev/sb1/backup

Rsync: a very practical file synchronization command, rsync is very practical Sync is a file synchronization and data transmission tool in Linux. It can be used to synchronize files and release code. 1. install. Yum install-y xinetdYum insatll-y