shell---if语句
vim if.sh #!/bin/bash //指定运行脚本的shell //脚本开始#File: if.sh
echo 'Hello, how old are you?'
echo 'Please input your age:'
read age //读入数据
if [ $age -eq 28 ]; then
echo "You're at the age of marriage!"
elif [ $age -gt 28 -a $age -lt 35 ]; then //判断年龄在28到35之间
echo "You must go on a blind date now."
elif [ $age -lt 28 ]; then
echo "You're still young and good to learn!"
else
echo "Sorry, I don't kown your age!"
fi //脚本结束
chmod +x if.sh //赋予执行权限
./if.sh //脚本当前路径下执行脚本
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