shell脚本

for i in `seq 9` ;do
    for j in `seq 9` ;do
        if [ $i -ge $j ];then
            let sum=${i}*${j}
            echo -e "${i}x${j}=$sumtc"
        fi                                                                                                              
    done
    echo
done

2.检查磁盘空间，一旦发现任何分区利用率高于80%，就发出警报

disk=`fdisk -l | egrep -o "^/dev/[[:alpha:]]+[0-9]"` 
#disk=`lsblk | sed -rn "s/^├─([[:alpha:]]{3}[1-9]).*/1/p"`
max_num=0
for name in `echo $disk`;do
        #有可能是交换空间，df命令就没有显示。直接跳过
        if ! df | egrep -o "^$name.*" &> /dev/null;then
                continue
        fi
        #获取使用空间和inodes
        num=`df | egrep -o "$name.*" | tr -s " " "%" | cut -d "%" -f 5`
        Inodes_num=`df -i | egrep -o "$name.*" | tr -s " " "%" | cut -d "%" -f 5`
        #使用空间和inodes大于80就发出警告。
        if [ $num -ge 80 -o $Inodes_num -ge 80 ];then
                if [ $num -gt $max_num ];then
                        max_num=$num
                        max_name=$name
                        max_Inodes_num=$Inodes_num
                elif [ $num -eq $max_num ];then
                        max_equal_num=$num
                        max_equal_name=$name
                        max_equal_Inodes_num=$Inodes_num
                fi
        fi
done
#判断是否有超过80的
if [ $max_num -ne 0 ];then
        let remaining=100-$max_num
        let Inodes_remaining=100-$max_Inodes_num
        #判断是否有两个分区使用量一样
        if [ -z $max_equal_num ];then
                wall The $max_name disk is about to run out,Only the remaining disk is 
                ${remaining}% and Inodes${Inodes_remaining}%
        else
                wall The $max_name and $max_equal_name disk is about to run out,Only 
                the remaining disk is ${remaining}% and Inodes${Inodes_remaining}%
        fi
fi