全文见：
http://www.ibm.com/developerworks/cn/linux/l-10sysadtips/* fuser
* reset
* screen
* GRUB
* ssh -R
* 保持登录状态：while [ 1 ]; do date; sleep 300; done
* ssh -p
* ssh -R
* ssh -L
* iperf
* P=1; for i in $(seq -w 200); do echo "192.168.99.$P n$i"; P=$(expr $P + 1);
done >>/etc/hosts
* for num in $(seq -w 200); do ssh n$num free -tm | grep Mem | awk '{print $2}';
done | sort | uniq
* free -m | grep Mem | awk '{print $2}'
* cat /dev/vcs1
* cat /proc/cpuinfo | grep processor | wc -l
* df -h
* dmidecode | less
* ethtool -i eth0
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