Linux CLI - Pipes and Redirection
What will be the output of the command sequence?
Assuming file.txt contains:
cat < file.txt | head -n 1
Assuming file.txt contains:
line1 line2 line3
What will be the output of the command sequence?
medium📝 Command Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand cat with stdin redirection
cat reads file.txt content via < and outputs all lines.Step 2: Pipe output to head -n 1
head -n 1 takes the first line from cat's output, which is 'line1'.Final Answer:
line1 -> Option DQuick Check:
Pipe output of cat < file to head -n 1 = first line [OK]
Quick Trick: Pipe cat < file to head -n 1 to get first line [OK]
Common Mistakes:
- Thinking head reads file directly
- Confusing pipe direction
- Assuming no output from cat
Master "Pipes and Redirection" in Linux CLI
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