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Make a script to backup different servers configs

#!/bin/sh
# $RedRiver: backup_config,v 1.9 2009/10/26 19:40:33 andrew Exp $

if [ `id -u` -ne 0 ]; then 
	echo You should run this as root! >&2
	exit 255
fi

FILE=/tmp/`hostname -s`-`date +%Y-%m-%d`.tar.gz
local _maxhomesize=`dc -e '50 1024 * p'`

local _list="/root \
  /etc \
  /var/backups \
  /var/cron \
  /var/www/conf"

local _mcfile=`grep '^### .*\.mc' /etc/mail/sendmail.cf | cut -d ' ' -f 2`
if [ X"${_mcfile}" != X"" ]; then
  _list="${_list} /usr/share/sendmail/cf/${_mcfile}"
fi

local _homesize=`du -ks /home/ | awk '{print $1}'`
if [ $_homesize -lt $_maxhomesize ]; then
	_list="${_list} /home/"
else
	echo Not backing up /home, too large!
fi

tar czf ${FILE} $_list

echo backed up $_list to
echo "\t$FILE"