这是一个小脚本,用于检查电池电量并调用自定义命令,此处为pm-hibernate,以防电池电量低于某个阈值.

#!/bin/sh

###########################################################################

#

# Usage: system-low-battery

#

# Checks if the battery level is low. If “low_threshold” is exceeded

# a system notification is displayed, if “critical_threshold” is exceeded

# a popup window is displayed as well. If “OK” is pressed, the system

# shuts down after “timeout” seconds. If “Cancel” is pressed the script

# does nothing.

#

# This script is supposed to be called from a cron job.

#

###########################################################################

# This is required because the script is invoked by cron. Dbus information

# is stored in a file by the following script when a user logs in. Connect

# it to your autostart mechanism of choice.

#

# #!/bin/sh

# touch $HOME/.dbus/Xdbus

# chmod 600 $HOME/.dbus/Xdbus

# env | grep DBUS_SESSION_BUS_ADDRESS > $HOME/.dbus/Xdbus

# echo 'export DBUS_SESSION_BUS_ADDRESS' >> $HOME/.dbus/Xdbus

# exit 0

#

if [ -r ~/.dbus/Xdbus ]; then

. ~/.dbus/Xdbus

fi

low_threshold=10

critical_threshold=4

timeout=59

shutdown_cmd='/usr/sbin/pm-hibernate'

level=$(cat /sys/devices/platform/smapi/BAT0/remaining_percent)

state=$(cat /sys/devices/platform/smapi/BAT0/state)

if [ x"$state" != x'discharging' ]; then

exit 0

fi

do_shutdown() {

sleep $timeout && kill $zenity_pid 2>/dev/null

if [ x"$state" != x'discharging' ]; then

exit 0

else

$shutdown_cmd

fi

}

if [ "$level" -gt $critical_threshold ] && [ "$level" -lt $low_threshold ]; then

notify-send "Battery level is low: $level%"

fi

if [ "$level" -lt $critical_threshold ]; then

notify-send -u critical -t 20000 "Battery level is low: $level%" \n 'The system is going to shut down in 1 minute.'

DISPLAY=:0 zenity --question --ok-label 'OK' --cancel-label 'Cancel' \n --text "Battery level is low: $level%.

The system is going to shut down in 1 minute." &

zenity_pid=$!

do_shutdown &

shutdown_pid=$!

trap 'kill $shutdown_pid' 1

if ! wait $zenity_pid; then

kill $shutdown_pid 2>/dev/null

fi

fi

exit 0

这是一个非常简单的脚本,但我认为您可以理解并轻松地根据您的需求进行调整.系统上的电池电量路径可能不同.稍微便携可能会使用像acpi一样的东西cut -f2 -d,以获得电池电量. cron可以安排此脚本每分钟运行一次.使用crontab -e编辑crontab并添加脚本：

*/1 * * * * /home/me/usr/bin/low-battery-shutdown

另一种解决方案是安装像Gnome或Xfce这样的桌面环境(并将窗口管理器更改为i3).两个提到的destop环境都有电源管理守护进程,它们负责关闭计算机电源.但我认为你故意不使用它们并且正在寻求更简约的解决方案.