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#######七级标题

########八级标题

#!/bin/bash
declare -i evenSum=0
declare -i i=2
while [ $i -le 100 ]; do
	let evenSum+=$i
	let i+=2
done
echo $evenSu

#!/bin/bash
#
cat << EOF
cpu）print cpu information
mem）print memory information
disk）print disk information
quit）quit
Enter your option
EOF
read -p "Enter your option: " option
option=`echo $option | tr 'A-Z' 'a-z'`
while [[ "$option" != "quit" ]]; do
if [[ "$option" == "cpu" ]]; then
	cat /proc/cpuinfo
elif [[ "$option" == "mem" ]]; then
	free -m
elif [[ "$option" == "disk" ]]; then
	df -h
else
	echo "Wrong option..."
fi
read -p "Enter your option again: " option
option=`echo $option | tr 'A-Z' 'a-z'`
done