[Solved] You run diff dir1 dir2 -r but get an error: diff: dir1: Is a directory. What is the problem? — Ans: You used -r incorrectly; it should be before the directory names | Linux CLI

Linux CLI - Viewing and Editing Files

You run diff dir1 dir2 -r but get an error: diff: dir1: Is a directory. What is the problem?

AYou used -r incorrectly; it should be before the directory names

BYou used -r but your diff version does not support it

CYou did not specify files inside the directories

DYou forgot to use the -r option for recursive directory comparison

Step-by-Step Solution

Solution:

Step 1: Understand the error
The error says 'dir1: Is a directory' which means diff treats dir1 as a file.
Step 2: Check option placement
The -r option must come before directory names. If placed after, diff treats directories as files.
Final Answer:
You used -r incorrectly; it should be before the directory names -> Option A
Quick Check:
Place -r before directories for recursive diff [OK]

Quick Trick: Put -r before directory names to compare recursively [OK]

Common Mistakes:

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You run diff dir1 dir2 -r but get an error: diff: dir1: Is a directory. What is the problem?