# Linux & Shell - Fundamentals (Data Engineering)

> Essential commands, navigation, permissions, pipes, redirections, bash scripting, cron jobs

- 20 interview questions
- Junior
- [Interview Questions: Data Engineering](https://sharpskill.dev/en/technologies/data-engineering/interview-questions.md)

## 1. Which command displays the current working directory in a Linux terminal?

**Answer**

The pwd (print working directory) command displays the absolute path of the current directory. It is essential for locating oneself in the file tree, especially when navigating between multiple folders or in bash scripts.

## 2. How to go back to the parent directory of the current directory?

**Answer**

The cd .. command allows moving up one level in the file tree. The double dots (..) represent the parent directory, while a single dot (.) represents the current directory. This notation is universal in Unix/Linux systems.

## 3. Which command lists directory files including hidden files?

**Answer**

The -a (all) option of the ls command displays all files, including hidden files that start with a dot. Without this option, files like .bashrc, .gitignore or .env are not visible in the listing.

## 17 more questions available

- What does the notation 755 represent in Linux permissions?
- Which command changes the owner of a file or directory?

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