Linux Essentials GEIR Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A security analyst needs to verify that the installed version of the OpenSSL package on a CentOS 8 system is up-to-date with the latest security patches. Which command should the analyst use?

   • Aapt list --installed openssl && apt update
   • Bdnf list --installed openssl && dnf check-update openssl
   • Crpm -q openssl && rpm -Uvh openssl
   • Dyum list openssl && yum update openssl
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2. 2expert · hard

   A system administrator needs to write a shell script that parses a log file and extracts the number of occurrences of the word 'ERROR' per day. The log lines are formatted like `2023-10-01 12:00:00 ERROR Something went wrong`. The script should output the date and the count, sorted by date. Which script snippet would accomplish this?

   • A`grep 'ERROR' logfile | awk '{print $1}' | sort | uniq -c | awk '{print $2, $1}'`
   • B`awk '/ERROR/ {print $1}' logfile | sort | uniq -c`
   • C`awk '/ERROR/ {count[$1]++} END {for (d in count) print d, count[d]}' logfile | sort`
   • D`grep 'ERROR' logfile | cut -d' ' -f1 | sort | uniq -c`
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4. 3application · medium

   A Linux administrator is troubleshooting a service that fails to start. The service logs to the systemd journal. Which command would show the most recent log entries for the service named `myapp.service`?

   • A`journalctl -b -u myapp.service`
   • B`journalctl -p err -u myapp.service`
   • C`journalctl -f -u myapp.service`
   • D`journalctl -u myapp.service -n 50`
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5. 4expert · hard

   A security analyst is investigating a suspicious process on a Linux server. The process is named `kworker` and is using high CPU. The analyst needs to determine if this process is legitimate or a masquerading process. Which command would provide the most useful information to make this determination?

   • A`ps -ef | grep kworker`
   • B`top -p <PID>`
   • C`ls -l /proc/<PID>/exe`
   • D`cat /proc/<PID>/status`
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6. 5foundation · easy

   While monitoring a system, an analyst runs the 'top' command. What is the primary purpose of this command?

   • AShow the current working directory of each process.
   • BList all processes with their full command lines in a static snapshot.
   • CDisplay the system's routing table and network interfaces.
   • DDisplay a real-time, dynamic view of running processes and system resource usage.
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