Question

Given that exactly 4 'httpd' processes are currently running on a Linux system, what will the command 'ps aux | grep httpd | wc -l' most likely output, and why?

Q: Answer-Given that exactly 4 'httpd' processes are currently running on a Linux system, what will the comman...

This is a well-known gotcha in process searching since the grep commands own invocation line grep httpd contains the search string httpd, it appears in the process listing and matches its own pattern, adding one extra count beyond the 4 genuine httpd processes. The typical fix is to exclude greps own line using grep httpd grep -v grep or use pgrep httpd instead.

A 4, because grep only matches actual running processes and automatically excludes itself

B 8, because ps aux lists each running process twice, once for the parent and once for the child

C 0, because piping the output of ps aux through grep suppresses all matching output

D 5, because the wc -l command always adds one extra line to account for a header row

E 5, because the grep command itself, containing the string 'httpd' in its own command line, is also matched by the pattern and counted

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Given that exactly 4 'httpd' processes are currently running on a Linux system, what will the command 'ps aux | grep httpd | wc -l' most likely output, and why?

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