[Solved] Why does this command fail?cat file.txt | tee — Ans: tee requires a filename argument to write output | Linux CLI

Linux CLI - Pipes and Redirection

Why does this command fail?

cat file.txt | tee

Atee does not accept input from pipe

Bcat cannot be piped into tee

Ctee requires a filename argument to write output

Dfile.txt does not exist

Step-by-Step Solution

Solution:

Step 1: Understand tee's argument requirement
tee needs a filename to write output to a file.
Step 2: Analyze command failure
No filename is given, so tee fails.
Final Answer:
tee requires a filename argument to write output -> Option C
Quick Check:
tee needs filename argument = tee requires a filename argument to write output [OK]

Quick Trick: tee always needs a filename unless output only [OK]

Common Mistakes:

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