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Linux (((install (at windows (medium (Command-Prompt(Admin): booting in…

- - - - at windows
        
        medium
        
        Command-Prompt(Admin): booting in Safe Mode
        bcdedit /set{current} minimal
        
        Bios:
        Intel RST ~> AHCI
        
        Command-Prompt(Admin): booting in Normal Mode
        bcdedit /deletevalue {current} safeboot
  - - - # distribution cat /etc/*-release # method 1 lsb_release -a # method 2 # kernel cat /proc/version # method 1 uname -a # method 2
  - - - sudo su
        
        cd / cd dev chmod 777 -R kvm
- - - - Bash
        
        Braces and parentheses
        
        Single quotes
        
        in string literals where you want to suppress interpolation and special treatment of backslashes as well as backticks.
        
        3 more items...
        
        Sorting and deduplication
        
        grep
        
        basics
        
        useful options
        
        Displaying n lines of cotext
        
        A <n> shows the entry and n lines A(fter) it,
        
        B <n> shows the entry and n lines B(efore) it,
        
        C <n> shows n lines before and after the entry, i.e. C(ontext).
        grep -B3 "hat" king.txt
        
        Recursive search
        search for text in multiple files located in the same directory or subdirectories
        grep -r "rain"
        only need occurrences, were they found
        grep -hr "rain"
        Regular expressions
        search term in quotes
        grep "^A" names.txt
        
        find
      - environment
        variables
        
        create
        not persistent
        
        export NEW_VARIABLE="The export command"
        NEW_VARIABLE="The export command" export NEW_VARIABLE
        
        remove
        
        unset NEW_VARIABLE
        
        show
        
        printenv
        printenv VARIABLE_NAME
        
        persistent
        
        /etc/environment
        system-wide configuration file used to store path and locale settings
        /etc/profile
        startup script file.
        Commands in this file are executed after user login
        ~/.bashrc
        user-specific startup script file
        contains configurations specific to the terminal.
        Commands in this file are executed when you run a new bash terminal.
      - Find and exec
        
        Archiving and extracting data
        
        File permissions
        
        Walking through directories in the command line
        
        dir -v
        
        cd -
        
        pushd ~/Downloads
        
        popd / popd +n
        
        What is an HTTP server?
        
        Introduction to API
        
        OSI Model
        
        Authentication and Authorization
        
        HTTP Basic Auth
        
        Checking External Resource
        
        ping
        
        SSH
        
        IP
        
        Getting data from net
        
        wget
        
        curl
      - Getting information about processes
        
        proc
        
        is a virtual folder that provides full detailed information about the system
        and lets you fine-tune many aspects of its configuration.
        
        For example, you may find out
        
        how much swap memory is currently being used,
        
        how large the processor cache size is
        
        which kernel modules are loaded,
        
        how many disks or partitions are available,
        
        and so on.
        
        is a virtual file system, it doesn't exist on disk or even in RAM.
        
        All subdirectories, files, and information stored in them are generated by the kernel at runtime.
        
        Therefore, any file from this folder contains new information each time.
        
        Basic monitoring
        
        uptime
        
        top
        
        htop
      - Package manager
        
        APT
        
        Installing and removing programs
        
        apt install <package-name>
        
        apt remove <package-name>
        
        apt purge <package-name>
        
        Updating programs
        
        apt update # update information
        
        /etc/apt/sources.list
        
        /etc/apt/sources.list.d
        
        apt upgrade # install packages
        
        update only some specific package
        
        apt update
        
        apt install <specific-package-name>
        
        Searching for packages
        
        apt search <package-name>
        
        apt show <package-name>
        
        Searching for files
        
        apt-file update # creates database apt-file search /bin/bash
        
        update / upgrade packages
        
        $ sudo apt update && sudo apt upgrade -y
        
        upgrade linux distro
        
        $ sudo apt update && sudo apt-get dist-upgrade
        
        remove packages that didn’t install completely.
        
        sudo apt-get autoclean
        
        remove your apt-cache:
        
        sudo apt-get clean
        
        remove software dependencies that you don’t need:
        
        sudo apt-get autoremove
      - modprobe
        adds and removes modules from the Linux kernel.