[Solved] What will be the output of diff -u fileA.txt fileB.txt if fileA.txt contains:line1line2line3and fileB.txt contains:line1lineXline3? | Linux CLI

Linux CLI - Viewing and Editing Files

What will be the output of diff -u fileA.txt fileB.txt if fileA.txt contains:
line1
line2
line3
and fileB.txt contains:
line1
lineX
line3
?

Aline2 replaced by lineX

B@@ -1,3 +1,3 @@\n line1\n-line2\n+lineX\n line3

CNo differences found

D2c2\n< line2\n---\n> lineX

Step-by-Step Solution

Solution:

Step 1: Understand unified diff (-u) output
The -u option shows context lines with '@@' and marks removed lines with '-' and added lines with '+'.
Step 2: Compare the files line by line
Only line 2 differs: 'line2' vs 'lineX'. The output shows this with context lines.
Final Answer:
@@ -1,3 +1,3 @@ line1 -line2 +lineX line3 -> Option B
Quick Check:
diff -u shows unified diff with context and line changes [OK]

Quick Trick: Use -u for unified diff showing context lines [OK]

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