Assuming you have a Mac with both wired Ethernet and Wi-Fi, this will show you whether or not the http/https proxy is set for both

proxystate.sh

#!/bin/zsh -f

PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin

	## Note:
	## ETHERNET_REGULAR / WIFI_REGULAR means http
	## ETHERNET_SECURE  / WIFI_SECURE  means https

ETHERNET_REGULAR=$(networksetup -getwebproxy Ethernet | awk -F' ' '/^Enabled:/{print $2}')

ETHERNET_SECURE=$(networksetup -getsecurewebproxy Ethernet | awk -F' ' '/^Enabled:/{print $2}')

WIFI_REGULAR=$(networksetup -getwebproxy Wi-Fi | awk -F' ' '/^Enabled:/{print $2}')

WIFI_SECURE=$(networksetup -getsecurewebproxy Wi-Fi | awk -F' ' '/^Enabled:/{print $2}')

if [ "$ETHERNET_REGULAR" = "" -a "$ETHERNET_SECURE" = "" ]
then
	# if Ethernet is not found, assume we are on a Mac without wired Ethernet (read: "a MacBook (Air|Pro)")

	if [ "$WIFI_REGULAR" = "Yes" -a "$WIFI_SECURE" = "Yes" ]
	then

		echo "Proxy ON"

	elif [ "$WIFI_REGULAR" = "No" -a "$WIFI_SECURE" = "No" ]
	then

		echo "Proxy OFF"

	else

		echo "Proxy Mixed\nWi-Fi http: $WIFI_REGULAR\nWi-Fi https: $WIFI_SECURE"

	fi

else

	if [ "$ETHERNET_REGULAR" = "Yes" -a "$ETHERNET_SECURE" = "Yes" -a "$WIFI_REGULAR" = "Yes" -a "$WIFI_SECURE" = "Yes" ]
	then

		echo "Proxy ON"

	elif [ "$ETHERNET_REGULAR" = "No" -a "$ETHERNET_SECURE" = "No" -a "$WIFI_REGULAR" = "No" -a "$WIFI_SECURE" = "No" ]
	then

		echo "Proxy OFF"

	else

		echo "Proxy Mixed\nEthernet http: $ETHERNET_REGULAR\nEthernet https: $ETHERNET_SECURE\nWiFi http: $WIFI_REGULAR\nWifi https: $WIFI_SECURE"

	fi

fi

exit 0