Which of the following commands can be used to search for a specific user's failed login attempts in the /var/log/secure file in a CentOS-based Linux distribution?Question 1Answera.grep "Failed password" /var/log/secure | grep usernameb.find /var/log/secure -name "Failed password" | grep usernamec.locate "Failed password" /var/log/secure | grep usernamed.search "Failed password" /var/log/secure | grep username
Question
Which of the following commands can be used to search for a specific user's failed login attempts in the /var/log/secure file in a CentOS-based Linux distribution?Question 1Answera.grep "Failed password" /var/log/secure | grep usernameb.find /var/log/secure -name "Failed password" | grep usernamec.locate "Failed password" /var/log/secure | grep usernamed.search "Failed password" /var/log/secure | grep username
Solution
The correct command to search for a specific user's failed login attempts in the /var/log/secure file in a CentOS-based Linux distribution is:
a. grep "Failed password" /var/log/secure | grep username
Explanation:
The 'grep' command is used in Linux to search for a specific pattern in files. The first part of the command 'grep "Failed password" /var/log/secure' searches for the pattern "Failed password" in the /var/log/secure file. The output of this command is then piped using '|' to another 'grep' command which further filters the output to lines containing 'username'.
The other commands (b, c, and d) are not correct because 'find', 'locate', and 'search' are not the right commands to search for a specific pattern within a file in Linux.
Similar Questions
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
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.
Question 5As a security analyst, you are monitoring network traffic and detect a large number of failed login attempts. Which of the following tools would help you investigate this incident? Select two answers.1 pointAn intrusion detection system (IDS)A cryptographic encoderAn antivirus softwareA network protocol analyzer (packet sniffer)
What command creates a new file called failed_logins.txt?1 pointrm failed_logins.txtmkdir failed_logins.txttouch failed_logins.txtfind failed_logins.txt
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