I use this code in gnu screen's statusbar:
backtick 1 1 1 sh -c 'perl -ne "/^(la|re|st)[^:]+:\s+(\S+)\s/and \$h{\
+$1}=\$2}{\$h{st}=~s/of.*/-/;\$h{st}=~s/on.*/+/;printfq(%.0f%%%s),\$h{
+re}*100/\$h{la},\$h{st}" /proc/acpi/battery/BAT0/* /proc/acpi/ac_adap
+ter/ACAD/state'
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