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Using SSH, Redirection, and Permissions in Linux

In this lab, we'll go over I/O redirection, file permissions, and using the `ssh` tool. These are skills that will serve you well in your career as a Linux sysadmin. Once complete, you’ll have a solid understanding of how to use these tools. *This course is not approved or sponsored by Red Hat.*

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Apr 05, 2019

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Table of Contents

  1. Challenge

    Enable SSH to Connect Without a Password from the `dev` User on `server1` to the `dev` User on `server2`

    We need to use SSH keys to satisfy this requirement, so generate them with this:

    [dev@server1]$ ssh-keygen

    Then run:

    [dev@server1]$ ssh-copy-id <server2 IP>
  2. Challenge

    Copy All tar Files from `/home/dev/` on `server1` to `/home/dev/` on `server2`, Extract Them, and Redirect Output to `/home/dev/tar-output.log`

    We need to use a method of copying files over a network. scp is the best tool, like this:

    [dev@server1]$ scp *.gz <server2 IP>:~/

    Then connect to server2 using ssh:

    [dev@server1]$ ssh <server2_IP>

    Then we can extract the files:

    [dev@server2]$ tar -xvf deploy_content.tar.gz >> tar-output.log
    [dev@server2]$ tar -xvf deploy_script.tar.gz >> tar-output.log

    Make sure to use >>, so that the output is appended rather than overwritten.

  3. Challenge

    Set the Umask So That New Files Are Only Readable and Writeable by the Owner

    The task is asking to make new files with the following permission: 0600.

    So we can do subtraction to figure out what our umask should be.

    0666 <-- Default

    0600 <-- Desired


    0066 <-- What we need to set

    So we run:

    [dev@server2]$ umask 0066
  4. Challenge

    Verify the `/home/dev/` Script Is Executable and Run It

    First, we check permissions on

    [dev@server2]$ ls -l

    There's no execute bit. Let's add one:

    [dev@server2]$ chmod +x

    And then run it:

    [dev@server2]$ ./

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!

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

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

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