Which of the following commands can be used to search for a specific user's login attempts in the /var/log/secure file in a CentOS-based Linux distribution?Select one:a.search username /var/log/secureb.locate username /var/log/securec.find /var/log/secure -name usernamed.grep username /var/log/secure

Which of the following commands can be used to search for all successful login attempts in the /var/log/secure file in a CentOS-based Linux distribution?Question 15Answera.find /var/log/secure -name "Accepted password"b.search "Accepted password" /var/log/securec.grep "Accepted password" /var/log/secured.locate "Accepted password" /var/log/secure

Which of the following commands can be used to search for all login attempts from a specific IP address in the /var/log/secure file in a CentOS-based Linux distribution?Question 16Answera.locate "sshd.*ip_address" /var/log/secureb.search "sshd.*ip_address" /var/log/securec.find /var/log/secure -name "sshd.*ip_address"d.grep "sshd.*ip_address" /var/log/secure

Which of the following commands can be used to view the last ten successful and failed login attempts in an OpenSSH server on a Linux system?Question 18Answera.cat /var/log/secure | tail -10b.head -10 /var/log/securec.tail -10 /var/log/secured.cat /var/log/secure | head -10

The Linux command that: "Finds out how many users are logged onto the system" is

Task 1. Search for error messages in a log fileIn this task, you must navigate to the /home/analyst/logs directory and report on the error messages in the server_logs.txt file. You’ll do this by using grep to search the file and output only the entries that are for errors.Navigate to the /home/analyst/logs directory.Use grep to filter the server_logs.txt file, and return all lines containing the text string error.Note: If you enter a command incorrectly and it fails to return to the command-line prompt, you can press CTRL+C to stop the process and force the shell to return to the command-line prompt.