Programmer Think

1, for loop statement 1. Grammatical structure: (1) List loop (2) Loop without list (3) Class C style for loop Format: for Variable name in Value list do Command sequence done 2. Usage: Read different variable values to execute the same set of commands one by one for loops are often used in scenarios where you already know ...

For the introduction of UBI, please refer to the official documents http://www.linux-mtd.infradead.org/doc/ubifs.html The following is a brief introduction. UBIFS relies on the kernel UBI subsystem and runs on MTD devices. UBI can manage its own partitions in applications For an introduction to SSD202, please refer to another blog post At ...

For Linux, the actual signal is a soft interrupt, similar to the hard interrupt in MCU. Many important programs need to process the signal. Signal, which provides a method for Linux to deal with asynchronous events. For example, if the end user inputs ctrl+c to interrupt a program, it will stop a program through the signal mechanism. Signal ov ...

Working principle of the whole system: Application layer - > API - > device driver - > Hardware Sending appropriate instructions can perform different operations. This rule is specified by the device driver.These rules are displayed through the api and called by the application layerThe application layer transmits the corresponding ...

Sample script [Unit] # Mainly service description Description=test # Simple description service After=network.target # Describes the service category, indicating that the service needs to be started after the network service is started Before=xxx.service # Indicates that some services need to be started Before they are ...

Introduction to Redis cluster Redis is an open source key value storage system. Due to its outstanding performance, most Internet enterprises use it for server-side cache. Before version 3.0, Redis only supported single instance mode. Although it supported master-slave mode and sentinel mode deployment to solve single point of failure, now I ...

preface Firewall of Linux system - netfilter/iptables: IP packet filtering system, which is actually composed of two components, netfilter and iptables. It mainly works at the network layer for IP packets. It is reflected in the processing of IP address, port and other information in the packet. 1, Relationship between netfilter and iptable ...

#####1, Brief implementation of ls(1) command. #include<apue.h> #include<dirent.h> int main(int argc,char *argv[]) { DIR *dp; struct dirent *dirp; if(argc!=2) err_quit("usage:ls directory_name"); if((dp=opendir(argv[1]))==NULL) err_sys("can't open %s",argv[1]); while((dirp=readdir(dp))!=NULL) p ...

OpenSSH server ◾ SSH (Secure Shell) protocol Is a secure channel protocolThe communication data is encrypted for remote management ◾ SSH profile Service Name: sshdServer main program: / user/sbin/sshdServer configuration file: / etc/ssh/sshd_configClient configuration file: / etc/ssh/ssh_config ◾ Service listening options Port ...

preface How to deploy the django project written locally to the linux server so that other small partners can access it? Taking centos system as an example, this paper deploys the locally written django project to the linux server Environmental preparation: Environmental preparation: 1. One Linux server, operating system: CentOS 7.4 64 bit 2. ...