Adding battery-suspend.sh

battery-suspend.sh

@@ -0,0 +1,50 @@
+#/bin/bash
+
+# battery-suspend.sh
+# This program suspends the computer when the battery gets too low
+# Copyright (c) 2024, Scott C. MacCallum (scm@sdf.org).
+# All rights reserved.
+
+# Redistribution and use of this software in source and binary forms, with or
+# without modification, are permitted provided that the following conditions
+# are met:
+
+# * Redistributions of source code must retain the above copyright notice,
+#      this list of conditions and the following disclaimer.
+
+# * Neither the name of Scott C. MacCallum nor the names of its
+#      contributors may be used to endorse or promote products derived from
+#      this software without specific prior written permission of Scott C.
+#      MacCallum.
+
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+# Change this variable to your batteries identification e.g. BAT0
+
+battery="BAT0"
+charge=$(cat /sys/class/power_supply/$battery/charge_now)
+discharge=$(cat /sys/class/power_supply/$battery/current_now)
+hours=$(echo "scale=2; $charge / $discharge" | bc)
+minutes=$(echo "scale=2; $hours * 60" | bc)
+minimum="0.16"
+
+# When 10 minutes of battery charge is left, let all users know that
+# the comptuer will be suspended and then suspend it
+
+if (( $(echo "$minutes < $minimum" | bc -l) )); then
+    echo "Suspending the computer! Power is needed!" | wall
+    sleep 3
+    systemctl suspend
+fi
+
+exit 0