Category:OS

  • Explain the grep command in shell

    Time:2020-4-2

    Search text files with ‘grep’ If you want to find a string in several text files, you can use the ‘grep’ command. ‘grep’ searches the text for the specified string. For example, suppose you are searching for a file with the string ‘magic’ in the ‘/ usr / SRC / Linux / documentation’ Directory: $ […]

  • Basic tutorial of using mdadm command to operate raid in Linux

    Time:2020-4-2

    Mdadm for building, managing and monitoring raid arrays Usage: mdadm –create device options…Using unused devices, create raid options,mdadm –assemble device options…Merge the RAID array you created earlier.mdadm –build device options…Create or merge a raid without metadata.mdadm –manage device options…Make changes to an existing arraymdadm –misc options… devicesReport or modify various MD related equipment.mdadm –grow options […]

  • Win10 20h1 preview 18990 image official open download

    Time:2020-4-2

    Microsoft launched windows 10 20h1 18990 preview for the quick preview channel. Today, Microsoft released this version of ISO image. This version is basically the same as the previous express channel. For those in-house users, if there is a problem with the system, you can reinstall through this image. In this version, Microsoft brings the […]

  • How to slow down MAC boot speed optimization tips

    Time:2020-4-2

    Some Mac users may feel that after a period of time, their MAC starts to power on more and more slowly. How can we optimize the Mac’s power on speed? Here are six tips to optimize the Mac’s power on speed. I hope they can help you. 1、 Try to delete desktop files Every time […]

  • How does Rsync synchronize hidden and excluded files? How does Rsync synchronize hidden and excluded files

    Time:2020-4-2

    The basic writing method of Rsync synchronization command Rsync command options source directory target directory If the source directory is written as / var / www /, all files in the directory will be synchronized to the target directory. If it is written as / var / www / *, the hidden files in the […]

  • Cleaning up the bat script of SVN file

    Time:2020-4-2

    The first one: compare the direct code and delete all SVN files in the current directory and subdirectory Copy codeThe code is as follows: @echo on color 2f mode con: cols=80 lines=25 @REM @Echo is cleaning up SVN files, please [email protected] loop deletes all SVN files in the current directory and [email protected] for /r . […]

  • Is coverdesigner.exe a secure process? CoverDesigner process query

    Time:2020-4-2

    Process file: CoverDesigner or coverdesigner.exeProcess name: ahead Nero CD cover designerProcess category: process with security risk English Description:CoverDesigner.exe is a process belonging to Ahead Neros CD Cover Designer. This program is non-essential process to the running of the system, but should not be terminated unless suspected to be causing problems. Chinese reference:Coverdesigner.exe is part of […]

  • The default installation location of subsystem (WSL) under Windows

    Time:2020-4-2

    Location: C:\Users\THINK\AppData\Local\Packages\CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc\LocalState\rootfs Note: think is my windows login user name. You can change it to your own user name. Once you know this folder, you can easily manage the file of subsystem. The written program can also be transferred to your own windows system to avoid the worry of program loss.

  • Shell code to determine whether the file is empty

    Time:2020-4-1

    Core code [[ `cat a.log |wc -l` -eq 0 ]] && echo “file is empty” Now I will introduce the cat and WC commands to you Cat: view the contents of a file, connect to a file, create one or more files, and redirect output to a terminal or file usage: cat [options] [file] 1. […]

  • Solutions to errors caused by too many operating files in Linux system

    Time:2020-4-1

    Solution to too many open files in Linux The reason for this prompt is that the number of file / socket connections opened by the program exceeds the system setting.View the maximum number of open files per user Copy code The code is as follows: ulimit [email protected]:~$ ulimit -a core file size (blocks, -c) 0 […]

  • Microsoft win10 mobile 1709 official version cumulative update push in October 2019

    Time:2020-4-1

    In addition to the cumulative update for windows 10 1903, Microsoft today pushed the October 2019 cumulative update for windows 10 mobile 1709 (autumn creator update). Windows 10 mobile’s October 2019 patch upgrades the operating system build to 15254.590 and provides multiple security and unknown performance improvements. Microsoft said that the changes included in the […]

  • Crontab specified execution user under CentOS

    Time:2020-4-1

    Under CentOS, crontab can be configured to execute tasks regularly. The execution body can be a system command or a script written by itself, and users can be assigned to execute it. There are two ways to configure crontab.Method 1. Use the crontab command, for example, to add a new or edit an existing one, […]