Linux

cd — Navigate the Linux Filesystem

Master the cd command: absolute paths, relative paths, home shortcuts, the parent directory, and the cd - trick that saves you every day.

January 7, 20255 min read

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cd (Change Directory) is the command you'll type more than almost any other. It moves you through the filesystem tree. Like walking between rooms — except you can teleport to any room instantly by knowing its full address.

Syntax

cd [DIRECTORY]

# cd is a shell builtin — use "help cd" not "man cd"
help cd

Special Shortcuts

cd Special Arguments

Shortcut	Description	Expands To
`cd`	Go home (no argument)	`cd /home/sagar`
`cd ~`	Go home (explicit)	`cd /home/sagar`
`cd ..`	Go up one level	Parent directory
`cd ../..`	Go up two levels	Grandparent directory
`cd -`	Toggle to previous directory	Last place you were
`cd .`	Stay in place (no-op)	Current directory

Absolute vs Relative Navigation

cd-examples.sh

# ─── Absolute paths (start with /) ──────────────────────────
cd /home/sagar/Documents     # Full path from root
cd /etc                      # System config directory
cd /var/log                  # Log files
cd /                         # The root itself

# ─── Relative paths (from where you currently are) ───────────
# Assuming you're in /home/sagar:
cd Documents                 # → /home/sagar/Documents
cd Documents/work            # → /home/sagar/Documents/work

# Assuming you're in /home/sagar/Documents:
cd ..                        # → /home/sagar
cd ../Downloads              # → /home/sagar/Downloads
cd ../../etc                 # → /etc (up 2, then into etc)

# ─── Home directory ──────────────────────────────────────────
cd                           # Go home — fastest way!
cd ~                         # Same thing, explicit ~
cd ~/Projects/myapp          # Go to a project folder

# ─── Back and forth ──────────────────────────────────────────
cd /var/log
cd /etc/nginx
cd -                         # → /var/log
cd -                         # → /etc/nginx  (keeps toggling!)

Real-World Patterns

These are the cd patterns you'll use every day in real work:

# Pattern 1: Go to project, work, return to where you were
cd ~/Projects/backend
# ... edit files, run tests ...
cd -                         # Back to previous directory instantly

# Pattern 2: Navigate to sibling directory
# Currently in: /home/sagar/Documents
cd ../Downloads              # Sibling — go up then sideways

# Pattern 3: Deep jump, then home
cd /var/lib/docker/volumes/abc123/_data
# deep work...
cd                           # Instant jump home, don't type the path

# Pattern 4: Tab completion (essential!)
cd /ho → Tab → /home/
cd /home/sa → Tab → /home/sagar/
cd /home/sagar/Pro → Tab → /home/sagar/Projects/

cd Has No man Page

cd is a shell builtin — it's built into bash/zsh itself, not an external program. That's why man cd typically opens a generic page or fails. Use help cd (bash) or run-help cd (zsh) to see the real documentation.

Quick Check

You're in `/home/sagar/Projects/backend/src`. Which command takes you to `/home/sagar/Projects/frontend`?

Quick Check

What does `cd -` do?

Exercise

Navigation drill — complete each step without using the up arrow:

Go to /var/log
Without typing the full path, go to the sibling /var/cache
Jump back to /var/log using one keystroke/command
Go three levels deep into your home directory (create folders if needed)
Return home with a single command