Nano and editing · Lesson 2 of 27 · 10 minutes

Editing config notes

Copy a system config into your lab, edit it safely, and compare the result.

Open the lab Course map

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learner@clairos:~ $

↑ history · Tab complete · Ctrl+C cancel · Esc, Tab to leaveExit 0

Your objectives

Hints are always available. Wrong turns never cost XP.

1
Copy config
Run mkdir -p lab, then cp /etc/nginx/sites-available/learn.conf lab/learn.conf.
Hint & worked example
Create a directory. -p also creates missing parent directories and accepts an existing directory. Copy a file to a new location, leaving the original in place.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
mkdir -p lab
cp /etc/nginx/sites-available/learn.conf lab/learn.conf
```
Remember: Creating a folder does not change the current directory. Confirm the destination before replacing a file. This lab supports file copies, not every cp option.
2
Edit the copy
Run nano lab/learn.conf. Save a nonempty note using the worked example below. Required evidence: # reviewed training copy.
Hint & worked example
Edit a virtual text file using the browser editor and explicitly save it.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
nano lab/learn.conf
```
Save this example in the editor:
```
server {
  listen 443 ssl;
  server_name learn.clairos.ai;
  root /srv/www;
  # reviewed training copy
}
```
Remember: Opening the editor does not complete a write task. Save and verify the contents.
3
Verify text
Run grep server_name lab/learn.conf.
Hint & worked example
Select input lines that match a pattern; -i ignores case, -n adds line numbers, and -v inverts selection.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
grep server_name lab/learn.conf
```
Remember: No matches is exit status 1, which is different from a malformed invocation.

Understand the pattern

Change control starts with preserving the original.

mkdir: Create a directory. -p also creates missing parent directories and accepts an existing directory.
Creating a folder does not change the current directory.
cp: Copy a file to a new location, leaving the original in place.
Confirm the destination before replacing a file. This lab supports file copies, not every cp option.
nano: Edit a virtual text file using the browser editor and explicitly save it.
Opening the editor does not complete a write task. Save and verify the contents.
grep: Select input lines that match a pattern; -i ignores case, -n adds line numbers, and -v inverts selection.
No matches is exit status 1, which is different from a malformed invocation.

Worked example and expected result

$ mkdir -p lab

(no output; exit 0)