# block in i3blocks.conf
[ssid]
label=
command=sh ~/.i3/ssid
interval=5

# ssid script
INTERFACE="${BLOCK_INSTANCE:-wlp59s0}"

ssid="$(iwconfig $INTERFACE | grep ESSID | awk '{print $4}' | tr -d 'ESSID:"')"

echo $ssid # full text
echo $ssid # short text
echo "#D33682"