Lab
A Cloud Guru

Turning Commands Into a Bash Script

In this hands-on lab, we're going to write a shell script for connecting to Linux Academy Linux servers from another Linux (or Mac) host, without having to first accept the RSA fingerprint.

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Path Info

Level

Beginner

Duration

30m

Published

Jul 12, 2019

Challenge

Determine What Options Should Be Used with the ssh Command

View the man page for the ssh command, and determine the option to use to disable host key checking.
Challenge

Build a Script from the Required Commands
1. Create a bin folder in cloud_user's home directory.
```
mkdir bin
```
1. Use Vim to create the file lab.sh in the new bin folder.
```
vim bin/lab.sh
```
1. Create the following script.
```
#!/bin/bash  

login_user=cloud_user
if [ -n $1 ]
then
    ssh -o StrictHostKeyChecking=no $login_user@$1
fi
```
1. Then, save the file by running.
```
:wq
```
Challenge

Execute and Verify the Script
1. Save the file, and make it executable.
```
chmod u+x bin/lab.sh
```
1. Run the script, passing 10.0.1.10 as the first parameter to be assigned to $1.
```
./bin/lab.sh 10.0.1.10
```
1. Press Ctrl + C to exit the password prompt.
Challenge

Add the New bin Directory to the PATH Variable
1. Append to the .bashrc file in cloud_user's home directory to add the new bin folder to the PATH environment variable.
```
echo 'PATH="$HOME/bin:$PATH"' >> .bashrc
```
1. Source .bashrc to pick up the change.
```
. .bashrc
```
1. Verify that you can run lab.sh without specifying the path to the script.
```
lab.sh 10.0.1.10
```

Author

A Cloud Guru

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.