Monday, 01/26/2026

🧳 Affirm due!

⏰ Meetings

Pay Affirm #money #todo
Check this weeks slide's. #cis238rh #cis238rh #todo
- Proofread. #todo
- Remove lab? #todo
Import grades. #cld110 #cld120 #todo
Check Canvas for accuracy. #cis126rh #cis238rh #cld110 #cld120
Print Attendance. #cis238rh #todo
Link next to next chapter slides. See CIS126RH. #cis238rh #todo

Create an empty file in students home directory named hello.sh.
Make the file executable.
Demonstrate the which ls command. What does the results of that command show you?
Now try the which command with hello.sh. How is the output different?
Move hello.sh into ~/bin. Create the directory if needed.
Again, run which hello.sh.
Explain why the output is different from the first time.

1.3 Close Vim to make script executable or move Step 1.3 to after you create the script.
2.1 Copy and paste
Explain what each step of the script does. #AI
:set number
ls -l will confirm that the script is executable.

Below is a step-by-step explanation of what this Bash script does and how each part works.

Shebang line

bash
#!/usr/bin/bash

This line tells the operating system to run the script using the Bash shell located at /usr/bin/bash.
When the script is executed, Bash interprets and runs each command in order.
Variable definitions
```
USER='student'
PREFIX='/home/student/output'
```
Each output file will be created in /home/student/ and will start with the name output.
Using variables makes the script easier to read and modify. For example, changing the username or output directory requires editing only one line.
The for loop
```
for SERVER in servera serverb; do
```
This loop iterates over two hostnames: servera and serverb.
During the first iteration, `SERVER` is set to servera.
During the second iteration, `SERVER` is set to serverb.
The commands inside the loop run once for each server.