Category:OS

  • Embedded development notes — debug component segger_ RTT

    Time:2021-6-14

    Author:zzssdd2 E-mail:[email protected] 1、 Preface In the process of embedded development, we often print out some debugging information to debug parameters and find problems. Usually, I use the chip’s serial port hardware device with serial port assistant software to debug. But the PCB hardware design of this project does not reserve serial port debugging interface, so […]

  • Using shell to simulate TCP protocol

    Time:2021-6-14

    Background of the problem The company has a set of message push system (hereinafter referred to as GCM), which takes over the client part due to personnel changes. After looking at the document, there are only a few pages of simple instructions in the communication protocol part. The code is too many and messy to […]

  • Group sorting function — row_ number()

    Time:2021-6-14

    1. MySQL 8.0 or above Usage 1: no grouping sort Row_ Number() over (order by field DESC)For example: row_ Number () over (order by DESC)All students are ranked from high to low, regardless of classUsage 2: Group sortROW_ Number () over (division by field 1 order by field 2 DESC)It means to group according to […]

  • Ofcpffsvc.exe – what is ofcpffsvc and what is its use

    Time:2021-6-14

    Process file: ofcpffsvc or ofcpffsvc.exeProcess name: OfficeScan personal firewallProcess category: processes with security risks English Description:OfcPfwSvc.exe is a process that belongs to the OfficeScan client from Trend Micro. This process should not be removed to ensure that your system security is not breached. Chinese reference:Sorry, there is no Chinese reference for the time being!By Trend […]

  • Win10 20h2 beta 19042.541 how to download kb4577063 update?

    Time:2021-6-14

      On September 23, Microsoft pushed the cumulative update 2020 for windows 10 version 20h2, which is suitable for x64 based systems(KB4577063)。 This update isOther updates, how to update to this version? Now let’s take a look at the detailed tutorial。 The system version before the update Win10 20h2 beta Preview19042.508 2020 – 09 cumulative […]

  • Using mshta call to run JS or vbs

    Time:2021-6-14

    Under the command line: Copy codeThe code is as follows: mshta javascript:window.execScript(“msgBox(‘hello youniao’):window.close”,”vbs“);  mshta vbscript:window.execScript(“alert(‘hello youniao’);”,”javascript”)

  • How does the Mac OS Big Sur status bar display keyboard brightness?

    Time:2021-6-14

    Big Sur this system to make the keyboard brightness display in the status bar, that is, in the menu bar, easy to view, how to display? Let’s take a look at the technique of MacOS Big Sur to display the keyboard brightness on the status bar. 1. Click preferences on the edge of the dock, […]

  • This paper introduces etc directory of Linux system and passwd file under it

    Time:2021-6-14

    Let’s take a look at the general contents of the etc directory /Etc directoryContains many files. Many network configuration files are also in / etc /etc/rc   or/etc/rc.d   or/etc/rc*.d  Start, or change the scripts or scripts directory running at runtime /etc/passwd  User database, in which domain gives user name, real name, home directory, encrypted password and […]

  • How to install the shutter screen capture program on CentOS? Command to install shutter successfully

    Time:2021-6-14

    problem: I want to try the shutter screen capture program on my CentOS desktop, but when I try to install shutter using yum, it always tells me “no shutter package is available.”. How can I install shutter on CentOS? Shutter is an open source (GPLv3) screen capture tool for Linux desktop. It comes packaged with […]

  • File lock of Linux shell

    Time:2021-6-14

    It is often necessary to block other processes in shell scripts, such as the mail queue script that comes with msmtp. The mutual exclusion of this script is incorrect. Here are three correct ways to achieve mutual exclusion through files. 1. Flock of util Linux This command has two uses:   flock LOCKFILE COMMAND   […]

  • Build Python environment with source insight

    Time:2021-6-13

    Si is a popular code reader / editor. Can I use Si for Python development? After a night’s experiment, I finally realized this function. 1. Syntax highlighting of Python Source insight version 4.0 already supports syntax highlighting of Python language by default, and there is no need to set it separatelyOf course, you can set […]

  • Ofps.exe – what is the process of ofps

    Time:2021-6-13

    Process file: ofps or ofps.exeProcess name: scansoft omniform moduleProcess category: processes with security risksEnglish Description: ofps.exe is a process associated with OmniForm from Scansoft. This is a non-essential process. Disabling or enabling this is down to user preference. Chinese reference:Sorry, there is no Chinese reference for the time being!Produced by: scansoftOf: scansoft omniformSystem process: noBackground […]