Here is a simple knowledge combing of LInux sed command. On the one hand, in order to consolidate the knowledge they have learned, on the other hand, I hope to help other small partners who are learning Linux.
sed (English: stream editor) stream editor
Text files can be processed and edited according to script instructions. Its main purpose ...
Posted by hawnted on Thu, 27 Jun 2019 11:25:29 -0700
When we develop a kernel driver, we are actually developing a module of the kernel. Any module will have an initialization load function and an uninstall function. When are they called? What's the difference between calling modules in static link form and dynamic load form? This article will answer these questions.
Any kernel module h ...
Posted by quintus on Wed, 26 Jun 2019 12:12:32 -0700
MongoDB Installation and Startup
1.1 windows Edition
Download the msi file on the mongodb official website. Double-click to run it. There is nothing to explain.
1.2 Linux Edition
curl -O https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-3.4.3.tgz # ...
Posted by latinofever on Wed, 26 Jun 2019 11:58:44 -0700
I. What is a message queue Message queue:
Message queuing provides a way to send a data block from one process to another. Each data block is considered to have a type. The data block received by the recipient process can have different type values. We can avoid the synchronization and blocking problems of named pipes by sending messages. So ...
Posted by coelex on Tue, 25 Jun 2019 15:14:13 -0700
Special permission set_uidBy default, under the newly installed Linux system, only one command has set_uid special privileges.Commands (files) with s privileges: To ensure that non-owner users have temporary ownership when using this command; set_uid special privileges for a file, provided that the file is an executable binary file (usually wit ...
Posted by dkjohnson on Sun, 23 Jun 2019 16:25:05 -0700
mysql report displays mysql status changes in a friendly way. In fact, it reports almost all the states. Unlike show status, which only shows more than 100 state values, mysql report interprets and formats these state values in a humane way, greatly increasing their readability.
The advantage of MySQL report is that it can quickly view variou ...
Posted by jackthebookie on Sun, 23 Jun 2019 15:28:10 -0700
MySql database installation network has more than N, following the blogger's personal test installation and steps are as follows. This article mainly uses non-compiled single instance installation.
1. Check and clear the original mysql in the system
[root@localhost~] # rpm-qa | grep mysql checks mysql in the system
Posted by rooky on Sun, 23 Jun 2019 15:12:51 -0700
Shell variables2.1. What is a VariableIn elementary school, we learned mathematical equations, such as: what is y equal to when x = 1 and y = x + 1 are known? In the above topics x and y are called unknowns, but in shell programming they are variable names, and 1 on the right of the equal sign and x+1 are variable contents. "=" i ...
Posted by szms on Sat, 22 Jun 2019 16:10:02 -0700
The Zygote process is Android and Java The founder of the world.stay android In the system, all application processes and SysteemServer processes come from the Zygote process fork.Its importance can be seen here.Although the Zygote process is equivalent to the root process of the Android system, in fact it is also the root process of the Androi ...
Posted by mraiur on Sat, 22 Jun 2019 09:44:42 -0700
Linux Lower serial communication mainly includes the following steps
Flow chart of serial communication
I will introduce these steps one by one.
1. Open the serial port
Code (serial port is ttyUSB0)
//Open Serial Port
Posted by frijole on Fri, 21 Jun 2019 14:32:16 -0700