Skip to content

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.
  • Labs icon Lab
  • A Cloud Guru
Google Cloud Platform icon

Getting Help at the Command Line

Linux systems have an average of 3,000 commands on them, so it's not feasible to know more than a couple of hundred of the commands well. In this lab, we'll discover how to find out more information about commands and files on the system.

Google Cloud Platform icon

Path Info

Clock icon Beginner
Clock icon 30m
Clock icon Nov 27, 2019

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.

Table of Contents

  1. Challenge

    Use Built-In Help and External Help Commands to Find Out More About a Given Command

    Get help for a command

    ls --help

    Output the help to a file so it can be searched

    ls --help > lshelp.txt

    Scroll through the file:

    less lshelp.txt

    Quit out of it by hitting q.

    Find out what will run with ls:

    which ls

    See if there are more on the system:

    which -a ls

    Find out more information about a command:

    whereis ls

    Find out what a command is:

    whatis crontab
  2. Challenge

    Use the `man` Command and Related Utilities to Find Out More Information on Desired Commands

    man -f crontab

    This will show us the sections.

    man man

    There will be a table that shows us the section numbers. Quit out of it by hitting q.

    man -f crontab
    man 5 crontab

    This takes us to the configuration file format of crontab. Quit out of it by hitting q.

    If we don't know which one we want, enter:

    man -a crontab

    It will show us the first one. Quit by hitting q. if we want the next one. Hit Enter.

  3. Challenge

    Investigate Additional Sources of Documentation on the System `tree`

    cd /usr/share/doc/packages

    Run the following:

    tree -H '/usr/share/doc/packages' -L 1 --noreport --charset utf-8 > ~/packages_index.html

    Note: If tree is not installed, you can install it by running sudo -i zypper in tree.

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.

Start learning by doing today

View Plans