command to ban an IP using sshguard. requires sudo/root

ban-ip

#!/usr/bin/env bash                                                                                                                                                     
USAGE="Usage: $0 ipv4-address"                                                                                                                                
BLACKLISTDB="/var/db/sshguard/blacklist.db"                                                                                                                   

if [ "$#" == "0" ]; then                                                                                                                                      
    echo "$USAGE"                                                                                                                                             
    exit 1                                                                                                                                                    
fi                                                                                                                                                            

TIMESTAMP=`date +%s`                                                                                                                                          
SSH_IPV4_BAN="|100|4|"                                                                                                                                        
IP=$1                                                                                                                                                         

echo "${TIMESTAMP}${SSH_IPV4_BAN}${IP}" >> ${BLACKLISTDB}                                                                                                     
systemctl restart sshguard