diff --git a/README.md b/README.md
index 0b29918..7d2662e 100644
--- a/README.md
+++ b/README.md
@@ -83,10 +83,16 @@ Usage:
         -n No interface check (Default: check interface)
         -x Run command (Default: echo only)
 
+    Note:
+        static replaces all IPv4 addresses.
+        Use comma-separated IP_SUBNET values to set secondary IP addresses.
+        The first IP_SUBNET is the primary IP address.
+
     Examples:
         nmcli-cli-ipv4 eno1 dhcp
-        nmcli-cli-ipv4 eno1 static 192.168.1.101/24 192.168.1.1 "192.168.1.1,10.0.0.2"
+        nmcli-cli-ipv4 eno1 static 192.168.1.101/24 192.168.1.1 192.168.1.1,10.0.0.2
         nmcli-cli-ipv4 eno1 static 192.168.1.101/24
+        nmcli-cli-ipv4 eno1 static 192.168.1.101/24,10.0.0.201/23
         nmcli-cli-ipv4 eno1 disable
 ```
 
@@ -112,6 +118,23 @@ nmcli connection modify eno1 ipv4.addresses "" ipv4.method auto
 # -> Create a bridge interface:
 #    nmcli-cli-bridge-add br1 "eno1"
 
+# [static with secondary address: echo only]
+# ==========================================
+# nmcli-cli-ipv4 eno1 static 192.168.1.101/24,10.0.0.201/23
+# echo only.
+nmcli connection modify eno1 ipv4.addresses 192.168.1.101/24,10.0.0.201/23 ipv4.method manual
+
+# Next steps:
+# -> Restart the interface:
+#    nmcli-cli-restart "eno1"
+#
+# -> Create a bond interface:
+#    nmcli-cli-bond-add bond1 mode=... "eno1" "ens2f0"
+# -> Create a vlan interface:
+#    nmcli-cli-vlan-add "eno1.100" 100 "eno1"
+# -> Create a bridge interface:
+#    nmcli-cli-bridge-add br1 "eno1"
+
 # [disable: dummy interface + echo only]
 # ======================================
 # nmcli-cli-ipv4 -n eno1 disable
@@ -133,7 +156,7 @@ nmcli connection modify eno1 ipv4.addresses "" ipv4.method disabled
 
 # [static: run it]
 # ================
-# nmcli-cli-ipv4 -x eno1 static 192.168.1.101/24 192.168.1.1 "192.168.1.1,10.0.0.2"
+# nmcli-cli-ipv4 -x eno1 static 192.168.1.101/24 192.168.1.1 192.168.1.1,10.0.0.2
 Applying: nmcli connection modify "eno1" ipv4.addresses "192.168.1.101/24" ipv4.method manual
 Applying: nmcli connection modify "eno1" ipv4.gateway "192.168.1.1"
 Applying: nmcli connection modify "eno1" ipv4.dns "192.168.1.1,10.0.0.2"
@@ -164,6 +187,7 @@ Usage:
     Examples:
         nmcli-cli-ipv4-copy eno1 bond1
         nmcli-cli-ipv4-copy bond1 br1
+        nmcli-cli-ipv4-copy eno1 bond1 (copy primary and secondary addresses)
         nmcli-cli-ipv4-copy eno1 (show current configuration)
 ```
 
@@ -174,7 +198,7 @@ Run examples:
 # ======================
 # nmcli-cli-ipv4-copy eno1 bond1
 # echo only.
-nmcli connection modify "bond1" ipv4.addresses "192.168.1.101/24" ipv4.method manual
+nmcli connection modify bond1 ipv4.addresses 192.168.1.101/24,192.168.1.102/24 ipv4.method manual
 nmcli connection modify bond1 ipv4.gateway 192.168.1.1
 nmcli connection modify bond1 ipv4.dns "192.168.1.1,10.0.0.2"
 
@@ -194,7 +218,7 @@ nmcli connection modify bond1 ipv4.dns "192.168.1.1,10.0.0.2"
 # [copy ipv4: run it]
 # ===================
 # nmcli-cli-ipv4-copy -x bond1 br1
-Applying: nmcli connection modify "br1" ipv4.addresses "192.168.1.101/24" ipv4.method manual
+Applying: nmcli connection modify br1 ipv4.addresses 192.168.1.101/24,192.168.1.102/24 ipv4.method manual
 Applying: nmcli connection modify br1 ipv4.gateway 192.168.1.1
 Applying: nmcli connection modify br1 ipv4.dns "192.168.1.1,10.0.0.2"
 
@@ -225,11 +249,17 @@ Usage:
         -n No interface check (Default: check interface)
         -x Run command (Default: echo only)
 
+    Note:
+        static replaces all IPv6 addresses.
+        Use comma-separated IP_SUBNET values to set secondary IP addresses.
+        The first IP_SUBNET is the primary IP address.
+
     Examples:
         nmcli-cli-ipv6 eno1 auto
         nmcli-cli-ipv6 eno1 dhcp
-        nmcli-cli-ipv6 eno1 static 2001:db8:1::101/48 2001:db8:1::1 "2001:db8:1::1,2001:db8:1::2"
+        nmcli-cli-ipv6 eno1 static 2001:db8:1::101/48 2001:db8:1::1 2001:db8:1::1,2001:db8:1::2
         nmcli-cli-ipv6 eno1 static 2001:db8:1::101/48
+        nmcli-cli-ipv6 eno1 static 2001:db8:1::101/48,2001:db8:2::201/64
         nmcli-cli-ipv6 eno1 link-local
         nmcli-cli-ipv6 eno1 disable
 ```
@@ -255,6 +285,23 @@ nmcli connection modify "eno1" ipv6.addresses "" ipv6.method dhcp
 # -> Create a bridge interface:
 #    nmcli-cli-bridge-add br1 "eno1"
 
+# [static with secondary address: echo only]
+# ==========================================
+# nmcli-cli-ipv6 eno1 static 2001:db8:1::101/48,2001:db8:2::201/64
+# echo only.
+nmcli connection modify eno1 ipv6.addresses 2001:db8:1::101/48,2001:db8:2::201/64 ipv6.method manual
+
+# Next steps:
+# -> Restart the interface:
+#    nmcli-cli-restart "eno1"
+#
+# -> Create a bond interface:
+#    nmcli-cli-bond-add bond1 mode=... "eno1" "ens2f0"
+# -> Create a vlan interface:
+#    nmcli-cli-vlan-add "eno1.100" 100 "eno1"
+# -> Create a bridge interface:
+#    nmcli-cli-bridge-add br1 "eno1"
+
 # [disable: dummy interface + echo only]
 # ======================================
 # nmcli-cli-ipv6 -n eno1 disable
@@ -276,7 +323,7 @@ nmcli connection modify "eno1" ipv6.addresses "" ipv6.method ignore
 
 # [static: run it]
 # ================
-# nmcli-cli-ipv6 -x eno1 static 2001:db8:1::101/48 2001:db8:1::1 "2001:db8:1::1,2001:db8:1::2"
+# nmcli-cli-ipv6 -x eno1 static 2001:db8:1::101/48 2001:db8:1::1 2001:db8:1::1,2001:db8:1::2
 Applying: nmcli connection modify "eno1" ipv6.addresses "2001:db8:1::101/48" ipv6.method manual
 Applying: nmcli connection modify "eno1" ipv6.gateway "2001:db8:1::1"
 Applying: nmcli connection modify "eno1" ipv6.dns "2001:db8:1::1,2001:db8:1::2"
@@ -307,6 +354,7 @@ Usage:
     Examples:
         nmcli-cli-ipv6-copy eno1 bond1
         nmcli-cli-ipv6-copy bond1 br1
+        nmcli-cli-ipv6-copy eno1 bond1 (copy primary and secondary addresses)
         nmcli-cli-ipv6-copy eno1 (show current configuration)
 ```
 
@@ -317,7 +365,7 @@ Run examples:
 # ======================
 # nmcli-cli-ipv6-copy eno1 bond1
 # echo only.
-nmcli connection modify bond1 ipv6.addresses 2001:db8:1::101/48 ipv6.method manual
+nmcli connection modify bond1 ipv6.addresses 2001:db8:1::101/48,2001:db8:1::102/48 ipv6.method manual
 nmcli connection modify "bond1" ipv6.gateway "2001:db8:1::1"
 nmcli connection modify "bond1" ipv6.dns "2001:db8:1::1,2001:db8:1::2"
 
@@ -337,7 +385,7 @@ nmcli connection modify "bond1" ipv6.dns "2001:db8:1::1,2001:db8:1::2"
 # [copy ipv6: run it]
 # ===================
 # nmcli-cli-ipv6-copy -x bond1 br1
-Applying: nmcli connection modify br1 ipv6.addresses 2001:db8:1::101/48 ipv6.method manual
+Applying: nmcli connection modify br1 ipv6.addresses 2001:db8:1::101/48,2001:db8:1::102/48 ipv6.method manual
 Applying: nmcli connection modify br1 ipv6.gateway 2001:db8:1::1
 Applying: nmcli connection modify br1 ipv6.dns "2001:db8:1::1,2001:db8:1::2"
 
@@ -865,13 +913,13 @@ nmcli connection add type vlan ipv4.method disabled ipv6.method ignore con-name
 nmcli connection add type bridge autoconnect yes ipv4.method disabled ipv6.method ignore bridge.stp no bridge.forward-delay 0 con-name "br1.100" ifname "br1.100"
 nmcli connection modify "bond1.100" connection.slave-type bridge connection.master "br1.100"
 
-# nmcli-cli-ipv4 -n br1.100 static 192.168.1.101/24 192.168.1.1 "192.168.1.1,10.0.0.2"
+# nmcli-cli-ipv4 -n br1.100 static 192.168.1.101/24 192.168.1.1 192.168.1.1,10.0.0.2
 # echo only.
 nmcli connection modify "br1.100" ipv4.addresses "192.168.1.101/24" ipv4.method manual
 nmcli connection modify "br1.100" ipv4.gateway "192.168.1.1"
 nmcli connection modify "br1.100" ipv4.dns "192.168.1.1,10.0.0.2"
 
-# nmcli-cli-ipv6 -n br1.100 static 2001:db8:1::101/48 2001:db8:1::1 "2001:db8:1::1,2001:db8:1::2"
+# nmcli-cli-ipv6 -n br1.100 static 2001:db8:1::101/48 2001:db8:1::1 2001:db8:1::1,2001:db8:1::2
 # echo only.
 nmcli connection modify "br1.100" ipv6.addresses "2001:db8:1::101/48" ipv6.method manual
 nmcli connection modify "br1.100" ipv6.gateway "2001:db8:1::1"
diff --git a/nmcli-cli-ipv4 b/nmcli-cli-ipv4
index 00915c2..84bac8b 100755
--- a/nmcli-cli-ipv4
+++ b/nmcli-cli-ipv4
@@ -44,10 +44,16 @@ Usage:
         -n No interface check (Default: check interface)
         -x Run command (Default: echo only)
 
+    Note:
+        static replaces all IPv4 addresses.
+        Use comma-separated IP_SUBNET values to set secondary IP addresses.
+        The first IP_SUBNET is the primary IP address.
+
     Examples:
         $0 eno1 dhcp
-        $0 eno1 static 192.168.1.101/24 192.168.1.1 "192.168.1.1,10.0.0.2"
+        $0 eno1 static 192.168.1.101/24 192.168.1.1 192.168.1.1,10.0.0.2
         $0 eno1 static 192.168.1.101/24
+        $0 eno1 static 192.168.1.101/24,10.0.0.201/23
         $0 eno1 disable
 
 _EOF_
diff --git a/nmcli-cli-ipv4-copy b/nmcli-cli-ipv4-copy
index cea6c63..cfb1d8f 100755
--- a/nmcli-cli-ipv4-copy
+++ b/nmcli-cli-ipv4-copy
@@ -35,9 +35,10 @@ echo_or_execute() {
 }
 
 nmcli_value() {
-    # Convert only nmcli's unset marker to an empty string.
+    # Convert nmcli's unset marker and multi-line values for reuse.
     local value=${1:-}
     [[ "${value}" == "--" ]] && value=""
+    value=${value//$'\n'/,}
     printf '%s' "${value}"
 }
 
@@ -54,6 +55,7 @@ Usage:
     Examples:
         $0 eno1 bond1
         $0 bond1 br1
+        $0 eno1 bond1 (copy primary and secondary addresses)
         $0 eno1 (show current configuration)
 
 _EOF_
@@ -84,7 +86,7 @@ ipv4_copy() {
     local SRC_IF_NAME=${1:-}
     local DEST_IF_NAME=${2:-${SRC_IF_NAME}}
 
-    # IP + Method
+    # IP + Method. ipv4.addresses may contain primary and secondary addresses.
     SRC_IP_SUBNET=$(nmcli_value "$(nmcli -g ipv4.addresses connection show "${SRC_IF_NAME}")")
     SRC_METHOD=$(nmcli_value "$(nmcli -g ipv4.method connection show "${SRC_IF_NAME}")")
     echo_or_execute nmcli connection modify "${DEST_IF_NAME}" ipv4.addresses "${SRC_IP_SUBNET}" ipv4.method "${SRC_METHOD}"
diff --git a/nmcli-cli-ipv6 b/nmcli-cli-ipv6
index f25ff1f..f414b0a 100755
--- a/nmcli-cli-ipv6
+++ b/nmcli-cli-ipv6
@@ -44,11 +44,17 @@ Usage:
         -n No interface check (Default: check interface)
         -x Run command (Default: echo only)
 
+    Note:
+        static replaces all IPv6 addresses.
+        Use comma-separated IP_SUBNET values to set secondary IP addresses.
+        The first IP_SUBNET is the primary IP address.
+
     Examples:
         $0 eno1 auto
         $0 eno1 dhcp
-        $0 eno1 static 2001:db8:1::101/48 2001:db8:1::1 "2001:db8:1::1,2001:db8:1::2"
+        $0 eno1 static 2001:db8:1::101/48 2001:db8:1::1 2001:db8:1::1,2001:db8:1::2
         $0 eno1 static 2001:db8:1::101/48
+        $0 eno1 static 2001:db8:1::101/48,2001:db8:2::201/64
         $0 eno1 link-local
         $0 eno1 disable
 
diff --git a/nmcli-cli-ipv6-copy b/nmcli-cli-ipv6-copy
index 3665c7e..2da733b 100755
--- a/nmcli-cli-ipv6-copy
+++ b/nmcli-cli-ipv6-copy
@@ -35,9 +35,10 @@ echo_or_execute() {
 }
 
 nmcli_value() {
-    # Convert only nmcli's unset marker to an empty string.
+    # Convert nmcli's unset marker and multi-line values for reuse.
     local value=${1:-}
     [[ "${value}" == "--" ]] && value=""
+    value=${value//$'\n'/,}
     printf '%s' "${value}"
 }
 
@@ -54,6 +55,7 @@ Usage:
     Examples:
         $0 eno1 bond1
         $0 bond1 br1
+        $0 eno1 bond1 (copy primary and secondary addresses)
         $0 eno1 (show current configuration)
 
 _EOF_
@@ -84,7 +86,7 @@ ipv6_copy() {
     local SRC_IF_NAME=${1:-}
     local DEST_IF_NAME=${2:-${SRC_IF_NAME}}
 
-    # IP
+    # IP. ipv6.addresses may contain primary and secondary addresses.
     SRC_IP_SUBNET=$(nmcli_value "$(nmcli -g ipv6.addresses connection show "${SRC_IF_NAME}")")
     SRC_METHOD=$(nmcli_value "$(nmcli -g ipv6.method connection show "${SRC_IF_NAME}")")
     echo_or_execute nmcli connection modify "${DEST_IF_NAME}" ipv6.addresses "${SRC_IP_SUBNET}" ipv6.method "${SRC_METHOD}"