Linux CLI - Pipes and Redirection
What will be the output of the command:
ps aux | grep bash | wc -l if there are 3 bash processes running?What will be the output of the command: ps aux | grep bash | wc -l if there are 3 bash processes running?
medium📝 Command Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand ps aux and grep bash
ps auxlists all processes.grep bashfilters lines containing 'bash'. This includes the 3 bash processes plus the grep command itself.Step 2: Count lines with wc -l
Since grep command line also contains 'bash', total lines are 4.Final Answer:
4 -> Option AQuick Check:
grep includes itself in output = 4 lines [OK]
Quick Trick: grep command appears in its own output unless excluded [OK]
Common Mistakes:
- Ignoring grep process line
- Assuming only matching processes count
- Miscounting lines
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