Absolute vs relative paths in Linux CLI - Quick Revision & Key Differences

Recall & Review

beginner

What is an absolute path in Linux?

An absolute path is the full address to a file or folder starting from the root directory /. It shows the exact location regardless of your current folder.

beginner

What is a relative path in Linux?

A relative path shows the location of a file or folder based on your current directory. It does not start with / and depends on where you are in the folder tree.

beginner

Which symbol represents the current directory in relative paths?

The dot . represents the current directory. For example, ./file.txt means the file is in the folder you are currently in.

beginner

How do you move up one directory level using a relative path?

Use two dots .. to move up one level. For example, ../file.txt means the file is in the parent folder of your current directory.

intermediate

Why might you prefer relative paths over absolute paths in scripts?

Relative paths make scripts more flexible because they work based on where you run them. Absolute paths always point to the same place, which can cause errors if files move or the script runs on another system.

Which of these is an absolute path?

A ./docs/file.txt

B docs/file.txt

C ../file.txt

D /home/user/docs/file.txt

Absolute paths always start with a slash / indicating the root directory.

What does ../ mean in a relative path?

A Parent directory

B Root directory

C Current directory

D Home directory

.. means the parent directory, one level up from the current folder.

If your current directory is /home/user, what absolute path does ./docs/file.txt refer to?

A /docs/file.txt

B /home/user/docs/file.txt

C /home/docs/file.txt

D /user/docs/file.txt

The dot . means current directory, so it adds docs/file.txt inside /home/user.

Which path is more flexible for scripts that move between folders?

A Absolute path

B Neither works in scripts

C Relative path

D Both are equally flexible

Relative paths adapt to the current folder, making scripts easier to move and reuse.

What does an absolute path always start with?

A /

B ~

C .

D ..

Absolute paths always start with a slash / which is the root directory.

Explain the difference between absolute and relative paths in Linux.

Think about how you find a file on your computer starting from the main folder versus from where you are now.

Describe how you would use relative paths to navigate up and down directories.

Imagine walking inside a building and moving up stairs or staying in the same room.

Practice

1. Which of the following is an absolute path in Linux?

easy

A. documents/reports

B. /home/user/documents

C. ./downloads

D. ../pictures

Solution

1. Step 1: Understand absolute path definition

   An absolute path always starts from the root directory, which is represented by /.

2. Step 2: Identify the path starting with /

   Only /home/user/documents starts with /, making it an absolute path.

3. Final Answer:

   /home/user/documents -> Option B

4. Quick Check:

   Absolute path starts with / = A [OK]

Hint: Absolute paths always start with a slash / [OK]

Common Mistakes:

• Confusing relative paths with absolute paths
• Thinking ./ or ../ are absolute paths
• Ignoring the leading slash in paths

2. Which command correctly changes directory to a relative path named projects inside the current folder?

easy

A. cd projects

B. cd .projects

C. cd /projects

D. cd ../projects

Solution

1. Step 1: Understand relative path usage in cd

   To move into a folder inside the current directory, you can use the folder name directly or prefix it with ./.

2. Step 2: Identify the simplest correct syntax

   cd projects uses cd projects, which is correct and simplest for relative path inside current folder.

3. Final Answer:

   cd projects -> Option A

4. Quick Check:

   Relative path inside current folder = cd projects [OK]

Hint: Use folder name alone to cd into relative path [OK]

Common Mistakes:

• Using leading slash for relative paths
• Confusing ../ with current directory
• Adding unnecessary ./ prefix

3. If your current directory is /home/user, what is the full absolute path of ../documents/report.txt?

medium

A. /documents/report.txt

B. /home/user/documents/report.txt

C. /home/documents/report.txt

D. /home/user/../documents/report.txt

Solution

1. Step 1: Understand .. in relative paths

   .. means move one directory up from current directory. From /home/user, going up one level is /home.

2. Step 2: Append the rest of the path

   After moving up, append documents/report.txt to get /home/documents/report.txt.

3. Final Answer:

   /home/documents/report.txt -> Option C

4. Quick Check:

   .. moves up one folder = /home/documents/report.txt [OK]

Hint: .. means go up one folder from current directory [OK]

Common Mistakes:

• Not moving up directory with ..
• Confusing relative and absolute paths
• Leaving .. in the final path

4. You run cd ../folder but get an error: bash: cd: ../folder: No such file or directory. What is the likely cause?

medium

A. The folder folder does not exist inside the parent directory

B. You used an absolute path instead of relative

C. You need to use ./folder instead

D. You must use cd /folder to access it

Solution

1. Step 1: Understand the error message

   The error says the directory ../folder does not exist, meaning the folder named folder is missing in the parent directory.

2. Step 2: Check the path usage

   The command uses relative path correctly. The problem is the folder is not found at that location.

3. Final Answer:

   The folder folder does not exist inside the parent directory -> Option A

4. Quick Check:

   No such file means folder missing at relative path [OK]

Hint: Check if folder exists in parent directory when using ../folder [OK]

Common Mistakes:

• Assuming syntax error instead of missing folder
• Confusing relative and absolute paths
• Trying to use ./ instead of ../ incorrectly

5. You are in /var/www/html. You want to copy a file index.html from /home/user/website to your current directory using a relative path. Which command is correct?

hard

A. cp /home/user/website/index.html .

B. cp ../../home/user/website/index.html .

C. cp ../../../../home/user/website/index.html .

D. cp ../../../home/user/website/index.html .

Solution

1. Step 1: Calculate relative path from /var/www/html to /home/user/website

   From /var/www/html, going up three levels: html -> www -> var reaches /. Then go into home/user/website.

2. Step 2: Form the relative path

   The relative path is ../../../home/user/website/index.html. So the command is cp ../../../home/user/website/index.html ..

3. Final Answer:

   cp ../../../home/user/website/index.html . -> Option D

4. Quick Check:

   3 ups to root, then home path = ../../../home/user/website [OK]

Hint: Count folders up to root, then add full path [OK]

Common Mistakes:

• Using too few ../ and missing root
• Using absolute path when asked for relative
• Confusing current directory (.) with parent (..)