init

.config/i3blocks/ssid/README.md

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+# ssid
+
+Show the SSID of the current wifi connection.
+If no instance is specified, wlan0 is used.
+
+Dependencies: `iw`
+
+# Config
+
+```
+[ssid]
+command=$SCRIPT_DIR/ssid
+#INTERFACE=wlan0
+interval=60
+```

.config/i3blocks/ssid/i3blocks.conf

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+[ssid]
+command=$SCRIPT_DIR/ssid
+#INTERFACE=wlan0
+interval=60

.config/i3blocks/ssid/ssid

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+#!/usr/bin/env bash
+# Copyright (C) 2020 hseg <gesh@gesh.uni.cx>
+# Copyright (C) 2014 Alexander Keller <github@nycroth.com>
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#------------------------------------------------------------------------
+if [[ -z "$INTERFACE" ]] ; then
+    INTERFACE="${BLOCK_INSTANCE:-wlan0}"
+fi
+#------------------------------------------------------------------------
+
+# As per #36 -- It is transparent: e.g. if the machine has no battery or wireless
+# connection (think desktop), the corresponding block should not be displayed.
+# Similarly, if the wifi interface exists but no connection is active, show
+# nothing
+[[ ! -d /sys/class/net/"${INTERFACE}"/wireless || \
+    "$(cat /sys/class/net/"$INTERFACE"/operstate)" = 'down' ]] && exit
+
+#------------------------------------------------------------------------
+
+SSID=$(iw "$INTERFACE" info | awk '/ssid/ {$1=""; print $0}')
+
+#------------------------------------------------------------------------
+
+echo "$SSID" # full text
+echo "$SSID" # short text
+echo "#00FF00" # color