Embedded Linux QT Development (iii)--gui principle analysis

embedded linux QT Development (III.)--GUI principle Analysis First,command-line programscommand-line programs are process-oriented programming.Features of the command-line program:A. Execution based on sequential structureB, the program execution

Basic Linux Essentials

################## two file addressing ###########Absolute path: file in the real location of the system , the file name begins with "/"relative path: The name of the file relative to the current location of the shorthand , which does not start with/

Serial communication and management of Linux

Linux serial port and windows have some differences, the following will introduce the Linux under the serial communication managementTo see if a USB port is supported:#lsmod | grep usbserialIf there is no information: sudo apt-get install

Linux Command-less command

Linux also has a command very similar to the more command--less command, compared to the more command, less command more flexible and powerful, today we will introduce the less command under Linux. For more information on Linux commands, see:

Linux 24th Day: (September 22) Linux DNS

Linux 24th Day: (September 22) Linux DNSChapter ContentName resolutionDNS ServiceImplementing a master-slave serverImplementing subdomainsImplement viewCompiling the installationPressure testDNS Error troubleshootingDNS ServiceDns:domain Name

Unix. Introduction to GNU and Linux

Introduction to Unix Operating systems1.Unix historyThe Unix operating system was born in Bell Labs in the late 60US Telephone and Telegraph Corporation (T) began issuing non-commercial UNIX licenses in the middle of the 70There have been different

Linux Fix OpenSSL vulnerability

Now there are many of the company's website is HTTPS encryption, not long ago, my site has just been wosign detected a loophole, https://wosign.ssllabs.com/, this is the detection of the Web site. What is the impact of this vulnerability,Baidu is a

Linux Text Processing Three Musketeers--awk

I. Introduction of AWKAho, Weinberger, Kernighan co-developed by three peopleReport Generator, formatted text outputAvailable in multiple Versions: New awk (Nawk), GNU awk (gawk)Mainstream version on Linux: gawk– mode scanning and processing

Beginner--linux First Lesson

The composition and function of the computerComputer systems consist of hardware systems and software systems. Computer hardware systems usually have "five bulky" components: input devices, output devices, memory, operators, and controllers.650)

Linux commands-chmod, chown, and CHGRP

each file and directory in a Linux system has access permissions, which are used to determine who can access and manipulate files and directories. access to a file or directory is divided into read-only, write-only, and executable three types. As an

Linux distributions and their descriptions

10 distributions of Linux and their descriptions10 of Linux distributions are Debian, Gentoo, Ubuntu, Damn vulnerable Linux, Red Hat Enterprise Linux, CentOS, Fedora, Kali Linux, Arch Linux, openSUSE, and more. DebianDebian is extremely stable

Set Linux environment variable Lang

Export lang= "zh_cn.gb118030"In general, it is necessary to set the environment variables of the Linux system only in/etc/profile (global) or ~/.BASHRC (single user). But for the lang variable, sometimes even if you export in all of these

Linux io mode and select, poll, Epoll detailed

Note: This article is a lot of blog learning and summary, there may be an understanding error. Please take a skeptical look at the same time if there are mistakes to be pointed out. What is the difference between synchronous IO and asynchronous Io,

Talking about Linux

The Linux system was originally evolved from the Minix operating system written by Andrew S.tanenbaum of the University of Helsinki in Finland, a small operating system used mainly for teaching, January 1991, Tanenbaum students Linus Torvalds found

Linux interprocess communication-semaphore semget (), Semop (), Semctl ()

This article will describe the mechanism of a communication between processes-the semaphore. Note: Please do not confuse it with the previously mentioned signal, the signal and the semaphore are different two kinds of things. For more information

Linux view CPU and memory usage

During system maintenance, it may be necessary to review the CPU usage at any time, and to analyze the system condition according to the corresponding information. In CentOS, you can view CPU usage by using the top command. After running the top

What is Linux

strictly speaking, Linux is just a kernel in an operating system. What is the kernel? The kernel establishes a platform for communication between computer software and hardware, and the kernel provides system services such as file management,

Linux Foundation Bash script Advanced-array

ArrayWhat is an array?An array in a computer refers to a data type that is organized in a certain order by a number of variables of the same type.The popular point is that the array is one of the variables, in terms of the current term is a variable

Linux Foundation Bash script Advanced-array

ArrayWhat is an array?An array in a computer refers to a data type that is organized in a certain order by a number of variables of the same type .The popular point is that the array is one of the variables, in terms of the current term is a

Arch Linux-based release Manjaro Linux 16.08 released

Manjaro Linux 16.08 was released.Manjaro Linux is a fast, user-friendly, desktop-oriented, Arch Linux-based operating system. Some of its notable features include an intuitive installer, automatic hardware detection, a stable scrolling release mode,

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