[Solved] Why does the command sort < produce an error? — Ans: Because no input file is specified after < | Linux CLI

Linux CLI - Pipes and Redirection

Why does the command sort < produce an error?

ABecause sort cannot read from stdin

BBecause no input file is specified after <

CBecause < is used for output redirection

DBecause sort requires an argument before <

Step-by-Step Solution

Solution:

Step 1: Understand the role of < in commands
< redirects input from a file, so it must be followed by a filename.
Step 2: Identify missing filename error
sort < without a filename causes an error because input source is missing.
Final Answer:
Because no input file is specified after < -> Option B
Quick Check:
Missing filename after < causes error [OK]

Quick Trick: Always specify a file after < for input redirection [OK]

Common Mistakes:

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Why does the command sort < produce an error?