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uname -a: Linux mx-ll-110-164-51-230.static.3bb.co.th 2.6.18-194.el5PAE #1 SMP Fri Apr 2 15:37:44
EDT 2010 i686 

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/usr/bin/   drwxr-xr-x
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Viewing file:     on_ac_power (1.57 KB)      -rwxr-xr-x

#!/bin/bash
#
# Test if the computer is running on line power
# Exit status:
# - 0 (true)  System is on AC power
# - 1 (false) System is not on AC power
#
# NOTE: Batteries are not good indicators unless we also check their type,
#       as some peripherals have batteries.
#
# Copyright 2006 Red Hat, Inc.
# Copyright 2006 Richard Hughes
#
# Based on work from:
#    Richard Hughes 
#    Peter Jones 
#    Stefan Seyfried 
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# Check for AC/DC/etc adapters
ac_adapters=$(hal-find-by-capability --capability ac_adapter)

# If there are no AC adapters, it is most likely a desktop.
# Assume online, since we have no data.
[ -z "$ac_adapters" ] && exit 0

# If any of them are online, then we're done.
for device in $ac_adapters ; do
	present=$(hal-get-property --udi $device --key ac_adapter.present)
	[ "$present" == "true" ] && exit 0
done

# If there are adapters, but none are online, we're not on AC.
exit 1

bool(false)