Linux CLI 2 🐧 Filesystem Navigation - KandZ

Linux organizes files in a hierarchical directory structure — a tree pattern starting from the root directory (/). Understanding how to navigate this tree is one of the most fundamental skills in the command line.

Introduction

cd /
ls
ls -la

Command	Description
`cd /`	Move to the root directory
`ls`	Show files and folders in the current directory
`ls -la`	Show detailed information (permissions, owners, sizes, hidden files)

Key concept:

Unix-like OSes (like Linux) organize files in a hierarchical directory structure
They’re organized in a tree pattern
The first directory is the root directory (/)
Under the root there are files and subfolders
Storage devices are mounted (attached) at various folders on the tree

Note: What you see depends on who the user is — permissions affect what you can access.

The Filesystem Tree

/                       ← Root directory
├── bin/                ← Essential binaries (ls, cp, mv)
├── boot/               ← Boot loader files
├── dev/                ← Device files (disks, terminals)
├── etc/                ← System configuration files
├── home/               ← User home directories
│   ├── kronos/         ← Your home directory
│   │   ├── Documents/
│   │   ├── Downloads/
│   │   └── test/       ← Example subdirectory
│   └── anotheruser/
├── lib/                ← Shared libraries
├── media/              ← Removable media (USB, CD)
├── mnt/                ← Temporary mount points
├── opt/                ← Optional software
├── proc/               ← Process information (virtual)
├── root/               ← Root user's home
├── sbin/               ← System binaries
├── srv/                ← Service data
├── sys/                ← System information (virtual)
├── tmp/                ← Temporary files
├── usr/                ← User programs and data
│   ├── bin/
│   ├── lib/
│   └── share/
└── var/                ← Variable data (logs, spools)
    ├── log/
    └── tmp/

Everything on Linux starts at / — including USB drives, external disks, and network shares. They’re “mounted” at specific directories in this tree.

Current Working Directory

pwd
cd home
ls
pwd
cd test
cd ..

Command	Description
`pwd`	Print Working Directory — shows where you are
`cd home`	Move into the `home` directory
`ls`	List contents of the current directory
`cd test`	Move into the `test` subdirectory
`cd ..`	Move up one level (to the parent directory)

Key concepts:

The current working directory is where you are right now in the tree
pwd displays it — like a “you are here” marker
/home is a path; its parent folder is the root /
/home/test is a path; test‘s parent is home, which is a child of root /
cd .. moves to the parent directory (one level up)

Path example:

/           ← root
└── home/   ← child of root
    └── test/  ← child of home, 2 levels deep

Navigating up:

# If you're in /home/test:
cd ..         # Moves to /home
cd ../..      # Moves to /
cd /          # Also moves to /

Tip: .. means “parent directory”. Chaining them (../..) moves up multiple levels.

User’s Home Directory

cd
cd ~
cd ~anotherUserName
cd -

Command	Description
`cd`	Changes to your home directory
`cd ~`	Also changes to your home directory (`~` = home)
`cd ~anotherUserName`	Changes to another user’s home directory
`cd -`	Changes to the previous working directory

Detailed breakdown:

Syntax	Meaning
`cd`	Shortcut for `cd ~` — goes home
`~`	Tilde — shorthand for your home directory (e.g., `/home/kronos`)
`~user`	Tilde + username — another user’s home
`-`	Dash — the previous directory (like “back” on a browser)

Examples:

# You're in /home/kronos/test
cd            # Now in /home/kronos
cd /etc       # Now in /etc
cd -          # Back to /home/kronos
cd -          # Back to /etc

Pro tip: cd - is a quick way to toggle between two directories — perfect for switching back and forth between your project folder and your notes.

Complete Example Session

Let’s walk through a full navigation session:

# 1. Check where you are
kronos@olympos:~$ pwd
/home/kronos

# 2. Go to the root directory
kronos@olympos:~$ cd /
kronos@olympos:/$ pwd
/

# 3. List the contents
kronos@olympos:/$ ls
bin   dev  home  lib64  mnt  proc  run   srv  tmp  var
boot  etc  lib   media  opt  root  sbin  sys  usr

# 4. Explore in detail
kronos@olympos:/$ ls -la
total 68
drwxr-xr-x  20 root root  4096 Jan 15 10:30 .
drwxr-xr-x  20 root root  4096 Jan 15 10:30 ..
lrwxrwxrwx   1 root root     7 Jan 15 10:30 bin -> usr/bin
drwxr-xr-x   4 root root  4096 Jan 15 10:30 boot
drwxr-xr-x  20 root root  3860 Jan 15 10:30 dev
drwxr-xr-x 120 root root 12288 Jan 15 10:30 etc
drwxr-xr-x   3 root root  4096 Jan 15 10:30 home
...

# 5. Go into /home
kronos@olympos:/$ cd home
kronos@olympos:/home$ ls
kronos  anotheruser

# 6. Go into your user directory
kronos@olympos:/home$ cd kronos
kronos@olympos:~$ pwd
/home/kronos

# 7. Create and navigate into a subdirectory
kronos@olympos:~$ cd test
kronos@olympos:~/test$ pwd
/home/kronos/test

# 8. Move up one level
kronos@olympos:~/test$ cd ..
kronos@olympos:~$ pwd
/home/kronos

# 9. Move up two levels with a single command
kronos@olympos:~$ cd ../..
kronos@olympos:/$ pwd
/

# 10. Go home and back
kronos@olympos:/$ cd
kronos@olympos:~$ pwd
/home/kronos

kronos@olympos:~$ cd /etc
kronos@olympos:/etc$ cd -
kronos@olympos:~$ pwd
/home/kronos

Quick Reference

Navigation Commands

Command	Description
`pwd`	Print working directory
`cd <dir>`	Change to `<dir>`
`cd` or `cd ~`	Change to home directory
`cd ..`	Move up one level
`cd ../..`	Move up two levels
`cd /`	Move to root
`cd -`	Move to previous directory
`cd ~user`	Move to another user’s home
`ls`	List files in current directory
`ls -la`	List with details + hidden files

Special Path Symbols

Symbol	Meaning	Example
`/`	Root directory	`cd /`
`~`	Home directory	`cd ~/Documents`
`.`	Current directory	`./script.sh`
`..`	Parent directory	`cd ..`
`-`	Previous directory	`cd -`
`~user`	Another user’s home	`cd ~alice`

`ls -la` Output Breakdown

drwxr-xr-x  20 root root  4096 Jan 15 10:30 etc
│└──┬───┘   │  │    │     │     │           │
│   │       │  │    │     │     │           └── Name
│   │       │  │    │     │     └────────────── Modified time
│   │       │  │    │     └──────────────────── Size (bytes)
│   │       │  │    └────────────────────────── Group
│   │       │  └─────────────────────────────── Owner
│   │       └────────────────────────────────── Link count
│   └────────────────────────────────────────── Permissions
└────────────────────────────────────────────── File type (d=dir)

Best Practices

✅ Do This:

# Always check where you are before navigating
pwd

# Use Tab to auto-complete directory names
cd Doc[Tab]         # Completes to Documents

# Use cd - to toggle between two directories
cd /var/log
cd ~
cd -                # Back to /var/log

# Use ls -la to see hidden files (starting with .)
ls -la              # Shows .bashrc, .config, etc.

# Use ~ for home to avoid typing long paths
cd ~/Documents/projects

❌ Don’t Do This:

# Don't use absolute paths when relative works
cd /home/kronos/Documents     # Use: cd ~/Documents

# Don't forget where you started
cd /etc
# ... 20 commands later ...
# Where was I? Use: cd - (if you haven't navigated elsewhere)

# Don't confuse .. and .
cd .                # Goes nowhere (current dir)
cd ..               # Goes up one level — that's what you want

# Don't type paths manually — use Tab
cd /usr/loc[Tab]    # Completes to /usr/local

Common Pitfalls

Pitfall	Problem	Solution
Forgetting `pwd`	Lost in the filesystem	Run `pwd` often
Confusing `..` and `.`	Wrong navigation	`..` = parent, `.` = current
Not using `Tab`	Typing errors	Use Tab to autocomplete
Absolute paths everywhere	Longer to type	Use relative paths + `~`
Forgetting `cd -`	Can’t get back	Use it to toggle directories

Visual Reference

Filesystem Hierarchy:
        /
        ├── bin/     ← Essential commands
        ├── etc/     ← Config files
        ├── home/    ← User directories
        │   ├── kronos/    ← Your home (~)
        │   │   ├── Documents/
        │   │   ├── Downloads/
        │   │   └── test/  ← You are here
        │   └── alice/
        ├── tmp/     ← Temporary files
        ├── usr/     ← Programs
        └── var/     ← Logs and data


Navigation shortcuts:
  cd /          → Root
  cd ~          → Home
  cd ..         → Parent
  cd -          → Previous
  cd test       → Into "test"
  pwd           → Where am I?

Summary

Concept	Description
Root (`/`)	Top of the filesystem tree
Home (`~`)	Your personal directory (`/home/kronos`)
`pwd`	Shows where you are
`cd`	Changes directory
`ls`	Lists files
`.`, `..`, `-`	Current, parent, previous

Remember: The filesystem is a tree. You’re always “somewhere” in that tree. Use pwd to confirm, cd to move, and ls to see what’s around you. And use Tab — it will save you from typos and make you faster!

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