npm install kmdr --global

yarn global add kmdr

$ kmdr
Usage: kmdr [options] [command]

The CLI tool for learning commands from your terminal

Learn more at https://kmdr.sh/

Options:
  -v, --version    output the version number
  -h, --help       output usage information

Commands:
  explain|e        Explain a shell command
  info|i           Display system-wide information
  login|l [email]  Log in to kmdr
  logout           Log out from kmdr
  settings|s       Adjust options and preferences
  version|v        Print current version and check for newer release

export PATH="$(yarn global bin):$PATH"

kmdr login

$ kmdr explain
✔ Enter your command · git commit -am "Initial Commit"

    git commit -am "Initial Commit"

  DEFINITIONS

    git
      The stupid content tracker
    commit
      Record changes to the repository
    -a, --all
      Tell the command to automatically stage files that have been modified and deleted
    -m, --message "Initial Commit"
      Use the given <msg> as the commit message

$ kmdr explain
? Enter your command: npm install kmdr@latest --global

    npm install kmdr@latest --global

  DEFINITIONS

    npm
      Package manager for the Node JavaScript platform
    install
      Install a package
    kmdr@latest
      The CLI tool for learning commands from your terminal
    -g, --global
      Install the package globally rather than locally

$ kmdr explain
? Enter your command: rsync -anv file1 file2

    rsync -anv file1 file2

  DEFINITIONS

    rsync
      A fast, versatile, remote (and local) file-copying tool
    -a, --archive
      This is equivalent to -rlptgoD.
    -n, --dry-run
      This makes rsync perform a trial run that doesn’t make any changes
      (and produces mostly the same output as a real run).
    -v, --verbose
      This option increases the amount of information you are given during
      the transfer.

$ kmdr explain
? Enter your command: ls -alh > contents.txt

    ls -alh > contents.txt

  DEFINITIONS

    ls
      List directory contents
    -a, --all
      Do not ignore entries starting with .
    -l
      Use a long listing format
    -h, --human-readable
      With -l and/or -s, print human readable sizes (e.g., 1K 234M 2G)
    > contents.txt
      Redirect stdout to contents.txt.

$ kmdr explain
? Enter your command: dmesg | grep 'usb' > output.log 2>error.log

    dmesg | grep 'usb' > output.log 2> error.log

  DEFINITIONS

    dmesg
      Print or control the kernel ring buffer
    |
      A pipe serves the sdout of the previous command as input (stdin) to the next one
    grep
      Print lines matching a pattern
    > output.log
      Redirect stdout to output.log.
    2> error.log
      Redirect stderr to error.log.