Files and paths · Lesson 22 of 36 · 8 minutes

Backup archive create

Create and list a small training backup archive.

Open the lab Course map

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learner@clairos:~ $

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Your objectives

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1
Create readme archive
Run tar -cf backups/readme-backup.tar README.txt.
Hint & worked example
Practice archive inventory, creation, and extraction in a simulated archive format.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
tar -cf backups/readme-backup.tar README.txt
```
Remember: These training archives are virtual data structures, not downloadable production tar files.
2
List archive
Run tar -tf backups/readme-backup.tar.
Hint & worked example
Practice archive inventory, creation, and extraction in a simulated archive format.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
tar -tf backups/readme-backup.tar
```
Remember: These training archives are virtual data structures, not downloadable production tar files.
3
Hash archive
Run sha256sum backups/readme-backup.tar.
Hint & worked example
Compare content digests to detect byte changes, not to establish who authored the file.
The command outcome must match the task, including successful access or the explicitly requested failure.
```
sha256sum backups/readme-backup.tar
```
Remember: A checksum detects changes only relative to a trusted expected digest.

Understand the pattern

Junior operators build confidence by gathering evidence before changing systems.

tar: Practice archive inventory, creation, and extraction in a simulated archive format.
These training archives are virtual data structures, not downloadable production tar files.
sha256sum: Compare content digests to detect byte changes, not to establish who authored the file.
A checksum detects changes only relative to a trusted expected digest.

Worked example and expected result

$ tar -cf backups/readme-backup.tar README.txt

created archive /home/learner/backups/readme-backup.tar

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

$ tar -tf backups/readme-backup.tar

README.txt

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

$ sha256sum backups/readme-backup.tar

1249d1cbe1d47795e8f30e5ae5c1e694d0ec772b50a0ed9d0f4a3b5ee451f8ab  /home/learner/backups/readme-backup.tar

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 “Backup archive create”, which interpretation is safe?A command appearing in history proves it completed successfully.A successful first check guarantees that every dependent service is healthy.These training archives are virtual data structures, not downloadable production tar files.

Apply it elsewhere

Before adapting the tar workflow from “Backup archive create” 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.

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