Programmer Group

catalogue 1, Common pipeline commands 1.1 sort command 1.2 uniq command 1.3 tr command 1.4cut command 1.5 examples 1.5.1 statistics of current host connection status 1.5.2 count the number of currently connected hosts 2, Regular expression 2.1 definition of regular expression 2.2 common metacharacters (supported tools: find, grep, eg ...

brief introduction curl is a common command-line tool for requesting Web servers. Its name means the URL tool of the client. Its function is very powerful, with dozens of command line parameters. If you are proficient, you can completely replace graphical interface tools such as Postman. This paper introduces its main command line paramete ...

Nginx solves the c10k problem by using multiplexing IO Technology (such as epoll of Linux, kqueue of FreeBSD, etc.), but the premise is that the request of nginx cannot have blocking operation, otherwise the whole nginx process will stop serving. However, blocking is inevitable in many cases. For example, when a client requests a static file, d ...

Working principle and configuration of nginx Module and working principle of nginx Nginx consists of kernel and modules. Among them, the design of the kernel is very small and concise, and the work completed is also very simple. Only by looking up the configuration file, the client request is mapped to a location block (location is an ins ...

Recently, I changed a new project team. Because the new team is relatively young and does not implement formal project management, I volunteered to contribute to team management and help the team establish agile project management. After many studies and comparisons, I chose the popular open source project management software: Zen. This is a do ...

Docker configures the master-slave environment of PostgreSQL13 preface PostgreSQL database supports a variety of replication solutions to build high availability, scalable and fault-tolerant applications, one of which is pre write log (WAL) delivery. This solution allows the use of file based log shipping or streaming replication, or, wher ...

Catalog 1. Definition of process 2. State and Transition of the Process 3. Process Control Block 4. Process number   5. Process Creation--fork Function 6. Process Creation   7. exit and _ exit function 8. Recycling of processes 1. wait function 2. waitpid function 9. Orphan Process 10. Zombie Process 1. Definition of p ...

Manually install MySQL version 5.7. X in CentOS 7.4 environment. 1. Install MySQL version: 5.7.25 2. Download address https://dev.mysql.com/downloads/mysql/5.7.html#downloads (as time goes by, please refer to the download address of the latest official website) 3. Use the wget command to download the relevant rpm files through breakpoint t ...

3.bash configuration file There are many bash shell configuration files, which can be divided into the following categories 3.1 it is divided into two categories according to the effective scope Global configuration: for all users /etc/profile /etc/profile.d/*.sh /etc/bashrc Personal configuration: only valid for specific users ~/.bash_p ...

1. Basic introduction Linux system is a multi-user and multi task operating system. Any user who wants to use system resources must first apply to the system administrator for an account, and then enter the system as this account. 2. Add user Basic grammar useradd username case Add a user milan. [root@hostName01 ~]# cd /home [root@ho ...