191. How do you change file permissions in Linux?
● chmod permissions file_name
192. How do you change file ownership in Linux?
● chown user:group file_name
193. How do you create a new user in Linux?
● useradd username
194. How do you set a password for a user?
● passwd username
195. How do you delete a user in Linux?
● userdel username
196. How do you add a user to a group?
● usermod -aG group_name username
197. How do you list groups in Linux?
● cat /etc/group
198. How do you secure SSH access?
● Disable root login by setting PermitRootLogin no in /etc/ssh/sshd_config
199. How do you configure SSH key-based authentication?
● Copy the public key to ~/.ssh/authorized_keys on the remote machine
200. How do you view system logs in Linux?
● journalctl or cat /var/log/syslog
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