Top Linux Commands for Security

# Change the current user's password.
passwd
# Switch to the root account with root's environment. (Login shell.)
sudo -i
# Execute your current shell as root. (Non-login shell.)
sudo -s
# List sudo privileges for the current user.
sudo -l
# Edit the sudoers configuration file.
visudo
# Display the current SELinux mode.
getenforce
# Display SELinux details such as the current SELinux mode, the configured mode, and the loaded policy.
sestatus
# Change the current SELinux mode to Permissive. (Does not survive a reboot.)
setenforce 0
# Change the current SELinux mode to Enforcing. (Does not survive a reboot.)
setenforce 1
# Set the SELinux mode to enforcing on boot by using this setting in the /etc/selinux/config file.
SELINUX=enforcing
# Set the SELinux mode to permissive on boot by using this setting in the /etc/selinux/config file.
SELINUX=permissive
# Set the SELinux mode to disabled on boot by using this setting in the /etc/selinux/config file.
SELINUX=disabled