Shell scripting · Lesson 5 of 31 · 8 minutes

Dirname in scripts

Use dirname to reason about script paths.

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

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1
Print script directory
Run dirname scripts/deploy.sh.
Hint & worked example
Extract the directory portion of a path string.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
dirname scripts/deploy.sh
```
Remember: A path can be syntactically valid without naming an existing directory.
2
Print config directory
Run dirname /etc/nginx/sites-available/learn.conf.
Hint & worked example
Extract the directory portion of a path string.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
dirname /etc/nginx/sites-available/learn.conf
```
Remember: A path can be syntactically valid without naming an existing directory.
3
Confirm working directory
Run pwd.
Hint & worked example
Print the directory that relative paths currently resolve from.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
pwd
```
Remember: A relative path is interpreted from the working directory, not necessarily the home folder.

Understand the pattern

Junior operators build confidence by gathering evidence before changing systems.

dirname: Extract the directory portion of a path string.
A path can be syntactically valid without naming an existing directory.
pwd: Print the directory that relative paths currently resolve from.
A relative path is interpreted from the working directory, not necessarily the home folder.

Worked example and expected result

$ dirname scripts/deploy.sh

/scripts

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

$ dirname /etc/nginx/sites-available/learn.conf

/etc/nginx/sites-available

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

$ pwd

/home/learner

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 “Dirname in scripts”, which interpretation is safe?A successful first check guarantees that every dependent service is healthy.A path can be syntactically valid without naming an existing directory.A command appearing in history proves it completed successfully.

Apply it elsewhere

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

Keep the momentum.

Complete the lab, then explain and apply the pattern.

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