Navigating the File System

2 min read

This chapter covers the essential commands for moving around and understanding your location within the Linux file system hierarchy.

1. Printing the Working Directory (`pwd`)

The pwd (Print Working Directory) command tells you exactly where you are in the file system hierarchy. It always outputs the absolute path starting from the root directory (/).

Execution

pwd

2. Changing Directories (`cd`)

The cd (Change Directory) command is the most frequently used command for moving between locations in the file system. It requires an argument specifying the destination path.

Essential `cd` Usage

Target	Command	Result
Home Directory	`cd` or `cd ~`	Moves you to your user’s home directory (e.g., `/home/username`).
Root Directory	`cd /`	Moves you to the top-most level of the file system.
Parent Directory	`cd ..`	Moves you one level up (the parent of the current directory).
Previous Directory	`cd -`	Toggles back to the last directory you were in.

Execution Examples

To move into a directory named Documents relative to your current location:

cd Documents

To move to a directory named bin which is two levels up from your current location:

cd ../../bin

To move directly to the home directory of a user named ‘alex’ (using an absolute path):

cd /home/alex

3. The Linux File System Hierarchy

The Linux file system is organized as a single inverted tree, starting at the root (/).

Understanding the primary top-level directories is helpful:

/ (Root): The base of the file system.
/home: Contains the personal directories for all non-root users (e.g., /home/alex).
/bin and /usr/bin: Contains essential binary executable programs (commands).
/etc: Contains global system configuration files.
/var: Contains variable data, such as logs, mail, and web server content.

4. Tab Completion

A key efficiency feature in the shell is tab completion. When typing a command, file name, or directory name, pressing the Tab key will automatically complete the name if it is unique. If multiple options match, pressing Tab twice will list all possible completions.