Prerequisite commands for Linux system Management

2. Man: to provide online help

   such as: #man ls

4. ls: Show directory contents

   -a displays all files in the current directory

   -L Show Permissions/owner/size/date of all files

   -S shows the space used for each file

   Example: Ls-la-s-S | More

6. mkdir: Creating an empty Directory

   such as: mkdir file

8. RmDir: Delete Empty directory

   such as: RmDir file

10. RM: Deleting files

    -RF forced recursive deletion

    such as: rm-rm/home/user/

12. CP: Copy command

    -A recursive copy directory equivalent to-DR

    -V Display procedure

    such as: Cp-a/etc/home/user-v

14. Cat: View Files

    such as: Cat 123.txt

    Example: Cat 123.txt 456.txt>7.txt (merge files)

16. MV: Move renaming file

    such as: MV 123.txt/home/user/

18. PWD: Displays the current directory path

20. Locate: Find file or directory commands

    Locate find assistance for naming dependent UpdateDB , schedule tasks to execute daily CRONTAB-E

    4 * * * updatedb

22. Find: Search for files in the directory

    find/root/data/-type F Find by file type

    find/root/data/-type f-exec rm-f {} \; and Reason

    find/root/data/-type F|xargs Rm-f and joining pipeline processing

    find/data/-type F! -name "4.txt" |xargs rm-f except 4.txt external processing

    Example: 1. Find 123.txt in the entire directory

    Find/-nmae 123.txt

    2. Find out if the/home directory is a "test" user's file

    Find/home-user Test

    3. Find the file with the permission "600" in the/home directory

    Find/home-perm 600

    4. Find more than 1MB files in the/home directory

    Find/home-size +1024k (or 1M)

    -type Search by file type F denotes normal document D directory! Take counter

    -name "file name" Search by file name

24. Date: Show set Date command

    Example: Change time is September 29 10:23

    Date 09291023

26. Clock: Displays the full date time

28. Tar: Unzip command

    such as: tar-zxvf/home/file.tar.gz

30. Zip: Press House command

    1. Compress all txt,jpg in the data directory to File.zip

    [Email protected] data]# Zip myfile *.txt *.jpg

    2. Compress all files contained under the data directory to File.zip

    [Email protected] data]# zip-r myfile *

32. Unzip: Extract command

    1. Unzip the Myfile.zip file

    [[email protected] data] #unzip Myfile.zip

    2. Extract the Myfile.zip file to the newly created directory new

    [[email protected] data] #unzip myfile.zip-d new

34. RPM: Software Installation

    1. Installation package

    RPM-IVH 123.rpm

    2. Deleting a package

    Rpm-e 123.rpm

    3. Upgrade Package

    RPM-UVH 123.RPM

    4. Query Package

    Rpm-q 123

35. Yum detailed

    I. Enumerating package files

    List all RPM packages that can be installed or updated in the repository

    # Yum List

    
    

    Lists the specific RPM packages that can be installed or updated and installed in the repository

    # Yum List Perl//List of packages named Perl

    # Yum List perl*//list the packages at the beginning of Perl

    
    

    List all RPM packages that can be updated in the repository

    
    

    # Yum List Updates

    List all RPM packages that have been installed

    
    

    # Yum List installed

    List RPM packages that have been installed but are not included in the repository

    
    

    # Yum List Extras

    Note: Extras is the name of the resource list defined in REPOS.D

    
    

    Ii. enumeration of resource information

    List all the RPM packages that can be installed or updated in the repository

    # Yum Info

    
    

    Lists the specific information in the repository that can be installed or updated and the RPM packages that have been installed

    # Yum Info perl//List Perl package information

    # Yum Info perl*//List all packages at the beginning of Perl information

    
    

    List information about all RPM packages that can be updated in the repository

    # Yum Info Updates

    
    

    List all the RPM packages that have been installed

    # Yum Info installed

    
    

    Lists information about the RPM packages that have been installed but are not included in the repository

    # Yum Info Extras

    
    

    Third, search

    Search for RPM packages that match specific characters

    # Yum Search Perl/searching in Package name, package description, etc.

    
    

    Search for RPM packages with a specific file name

    # YUM provides realplay

    
    

    Iv. Management Pack

    Installing RPM Packages

    # yum Install Perl//Installation Perl package

    # yum Install perl*//install Perl at the beginning of the package

    
    

    Remove RPM packages, including packages that are dependent on the package

    # yum Remove perl*//will remove all perl-* packages

    
    

    Five, update

    Check for updatable RPM packages

    # yum Check-update

    
    

    Update all RPM Packages

    # Yum Update

    
    

    Update specified RPM packages, such as update kernel and kernel source

    # Yum Update kernel Kernel-source

    
    

    A large-scale version upgrade, unlike Yum Update, even the old obsolete package is upgraded

    # Yum Upgrade

    
    

    Six, empty the cache

    Clear the Staging RPM package file

    # Yum Clean Packages

    
    

    Purge the RPM header files in the staging

    # Yum Clearn headers

    
    

    Clear the old RPM header files in the staging

    # Yum Clean oldheaders

    
    

    Purge old RPM header files and package files in staging

    # Yum Clearn

    Or

    # Yum Clearn All

    
    

    Vii. Other

    Install livna.org RPMs GPG key

    # RPM--import Http://rpm.livna.org/RPM-LIVNA-GPG-KEY

    
    

    Check GPG Key

    # Rpm-qa gpg-pubkey*

    
    

    Display key Information

    # Rpm-qi Gpg-pubkey-a109b1ec-3f6e28d5

    
    

    Delete key

    # RPM-E Gpg-pubkey-a109b1ec-3f6e28d5

This article is from the "Airsky Learning Linux" blog, so be sure to keep this source http://airsky.blog.51cto.com/969074/1785543

Prerequisite commands for Linux system Management