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#!/bin/sh
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PATH=/sbin:/bin:/usr/bin
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# Get the ID of the first active X11 session:
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uid_session=$(
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ck-list-sessions | \
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awk '
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/^Session[0-9]+:$/ { uid = active = x11 = "" ; next }
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{ gsub(/'\''/, "", $3) }
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$1 == "unix-user" { uid = $3 }
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$1 == "active" { active = $3 }
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$1 == "x11-display" { x11 = $3 }
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active == "TRUE" && x11 != "" {
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	print uid
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	exit
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}')
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# Check that there is a power manager, otherwise shut down.
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[ "$uid_session" ] &&
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ps axo uid,cmd | \
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awk '
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    $1 == '$uid_session' &&
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	($2 ~ /gnome-power-manager/ || $2 ~ /kpowersave/) \
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		{ found = 1; exit }
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    END { exit !found }
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' ||
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  shutdown -h now
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