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1, sort command 1. The role of sort Sort the contents of files in behavioral units, or according to different data types 2. Syntax format sort [option] parameter cat file | sort option 3. Common options Common optionseffect-fIgnore case and convert all lowercase letters to uppercase letters for comparison-bIgnore spaces before each ...

1, Separation and layering of linux Driver The device drivers we wrote in the previous chapters are very simple. They are the simplest read and write operations for IO. The drivers of complex peripherals such as I2C, SPI and LCD cannot be written in this way. Linux system should consider the reusability of drivers, so it puts forward the ...

1, Overview of mutual exclusion and synchronization In a multitasking operating system, multiple tasks running at the same time may need to access and use the same resource There are dependencies between multiple tasks, and the operation of one task depends on another task Synchronization and mutual exclusion are used to solve these two prob ...

Today's content Introduction to NFS Implement NFS file synchronization NFS configuration details Unified user Building web Services NFS for file sharing Detailed content 1. Introduction to NFS 1.1 INTRODUCTION Realize multiple web The server can share data resources, just put each web The data storage of the server is independent and stored i ...

How to use Linux Netlink 1, Netlink user mode construction process 1. Create a netlink based on a custom port_ Test socket. #define NETLINK_TEST 99 skfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_TEST); //Create a socket using user defined protocol NETLINK_TEST. if (skfd == -1) { perror("create socket error\n"); return -1; } 2. Initialize s ...

Article catalog Fixed networking IP Modify IP using command Open the network card configuration file VIM / etc / sysconfig / network scripts / ifcfg-ens32 Question 1: if you still can't ping Baidu after setting it, what's the reason?Turn off the firewall and set it to turn off automatically after startupSet selinux to turn off automatically af ...

1. Add data to the table 1.1 problems Insert data into the employees tableInsert data into the salary tableThe inserted data needs to be commit ted to the database 1.2 steps To implement this case, you need to follow the following steps. Step 1: PyMySQL installation Install gcc. Some software packages are the source code of C [root ...

origin # One day, a colleague on the product side contacted him and reported an error in the bill transmission program. The phenomenon is as follows: In fact, the node only provides an sftp service for the product side to transmit bills for temporary storage, which is taken away by the billing department. analysis # So I asked my o & M c ...

1, What is pipeline Pipeline, also known as anonymous pipeline, is a special type of file, which is embodied as two open file descriptors in the application layer Anonymous pipeline is created in kernel space. Multiple processes know the space of the same anonymous pipeline and can use it to communicate The anonymous pipeline will give the ...

Last article Analysis of Linux netfilter hook source code From the perspective of kernel source code, we analyze how hook hooks are executed under the Linux Netfilter framework. This time, we write a simple example code to introduce in detail how to write kernel modules using the Netfilter framework. In the previous article, we analyzed the ...