Added netmask confirmation

provision_new_server.sh

@@ -7,6 +7,7 @@ name_old=$(cat /etc/hostname)
 #ipadd_old=$(ifconfig | awk '/inet6/{next;} /127.0.0.1/{next;} /inet/{print $2;}' | grep 172.23)
 cidr_old=$(ip a | awk '/inet6/{next;} /127.0.0.1/{next;} /inet/{print $2;}' | grep 172.23)
 ipadd_old=$(echo $cidr_old | awk -F '/' '{print $1}')
+ipc_present=false
 
 # Get user input
 echo "Enter new host information."
@@ -27,11 +28,20 @@ if ! echo $cidr | grep -E "^$n(\.$n){3}/$m$" &>/dev/null; then
     exit 12
 fi
 # End input sanity check
+
+# Test if 'ipcalc' utility is available
+which ipcalc &>/dev/null && ipc_present=true
+
 ipadd=$(echo $cidr | awk -F '/' '{print $1}')
 echo
-
 printf "Review these changes carefully!\n\n"
+if [ "$ipc_present" = true ]; then
+    snm=$(ipcalc $cidr | grep Netmask | grep -Eo "($n.){3}$n")
+    snm_old=$(ipcalc $cidr_old | grep Netmask | grep -Eo "($n.){3}$n")
+    printf "+,CURRENT,PENDING\nHostname:,$name_old,$name\nAddress:,$ipadd_old,$ipadd\nCIDR:,$cidr_old,$cidr\nNetmask:,$snm_old,$snm" | column -s, -t
+else
     printf "+,CURRENT,PENDING\nHostname:,$name_old,$name\nAddress:,$ipadd_old,$ipadd\nCIDR:,$cidr_old,$cidr" | column -s, -t
+fi
 echo
 read -p "Are you sure you want to apply the changes above? (y/N)" -n 1 -r
 if echo $REPLY | grep -Eq '^[Yy]$'; then