Terminal basics · Lesson 10 of 34 · 7 minutes

Option patterns

Compare short flags and long listings in a safe directory.

Open the lab Course map

Mastery 0/3Run itExplain itApply it

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
Long list home
Run ls -l /home/learner.
Hint & worked example
List directory entries; -a includes hidden names and -l adds ownership and permission detail.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
ls -l /home/learner
```
Remember: A listing is not proof that you can read or modify every listed file.
2
All list etc
Run ls -la /etc.
Hint & worked example
List directory entries; -a includes hidden names and -l adds ownership and permission detail.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
ls -la /etc
```
Remember: A listing is not proof that you can read or modify every listed file.
3
Review ls options
Run man ls.
Hint & worked example
Read a short built-in teaching reference for one supported command.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
man ls
```
Remember: For real administration, check the installed command manual and version too.

Understand the pattern

Reading options carefully prevents wrong assumptions about hidden files or metadata.

ls: List directory entries; -a includes hidden names and -l adds ownership and permission detail.
A listing is not proof that you can read or modify every listed file.
man: Read a short built-in teaching reference for one supported command.
For real administration, check the installed command manual and version too.

Worked example and expected result

$ ls -l /home/learner

ddrwxr-xr-x learner learners   dir archive
ddrwxr-x--- learner learners   dir backups
ddrwxr-xr-x learner learners   dir data
ddrwxr-xr-x learner learners   dir lab
ddrwxr-xr-x learner learners   dir notes
ddrwxr-xr-x learner learners   dir projects
--rw-r--r-- learner learners   148 README.txt
ddrwxr-x--- learner learners   dir restore
ddrwxr-xr-x learner learners   dir scripts

Exit status: 0. The command completed successfully in the training fixture.

$ ls -la /etc

--rw-r--r-- root root    84 crontab
--rw-r--r-- root root    64 group
--rw-r--r-- root root    17 hostname
--rw-r--r-- root root    49 hosts
ddrwxr-xr-x root root   dir logrotate.d
--rw-r--r-- root root    62 motd
ddrwxr-xr-x root root   dir nginx
--rw-r--r-- root root    71 os-release
--rw-r--r-- root root   147 passwd
--rw-r--r-- root root    55 resolv.conf
ddrwxr-xr-x root root   dir ssh
ddrwxr-x--- root root   dir sudoers.d
ddrwxr-xr-x root root   dir systemd

Exit status: 0. The command completed successfully in the training fixture.

$ man ls

LS(1)
NAME
  ls - list simulated directory contents
SYNOPSIS
  ls [-la] [path]
NOTE
  Use -a for hidden dotfiles and -l for metadata.

Exit status: 0. The command completed successfully in the training fixture.

Try a variation

Repeat this workflow in the sandbox with a different scratch filename. Keep the system fixtures unchanged and compare the observed output with your expectation before moving on.

Explain it

In “Option patterns”, which interpretation is safe?A command appearing in history proves it completed successfully.A successful first check guarantees that every dependent service is healthy.A listing is not proof that you can read or modify every listed file.

Apply it elsewhere

Before adapting the ls workflow from “Option patterns” to another server, what should you do?Skip output inspection whenever the command is familiar.Confirm the current directory, target identity, permissions, and the installed command behavior first.Paste the training paths unchanged into production.

Keep the momentum.

Complete the lab, then explain and apply the pattern.

Next: Safe movement Try an incident drill

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