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用shell脚本自动添加分区，已实现功能如下：1.检查扩展分区是否，且是否可以添加，如果可以则把所有的剩余空间设置为扩展分区2.当扩展分区存在，则输入要添加的分区大小，仅接受大于1的正整数代码如下：#！/bin/bash
Hard="/dev/sda"
Exten=`fdisk -l $Hard|grep Extended`
Maxnum=`fdisk -l $Hard|grep -o "^/dev/sda[1-9]>"|tr -d [[:punct:]]|tr -d "A-Za-z"|sort -n|tail -1`
if [[  -z $Exten ]];then
        if [[ $Maxnum -ge 4 ]];then
                echo "Disk partitions error！..."
                exit 1
        elif [ $Maxnum -eq 1 -o $Maxnum -eq 2 ];then
#       echo "1---3"
                cat << EOF
                e|E）use all free disk greate is Extended;
                *）Quit;
EOF
                Sdanum=$（（Maxnum+1））
                read Opt
                case $Opt in
                e|E）
fdisk $Hard &> /opt/fdisk.log <<EOF
n
e
$Sdanum
wEOF
                ;;
                *）
                echo "None operating ,Exit"
                exit 2
                ;;
                esac
        else
                cat << EOF
        e|E）use all free disk greate is Extended;
        *）Quit;
EOF
                read Opt
                case $Opt in
                e|E）
                fdisk $Hard &> /opt/fdisk.log <<EOF
                n
                e
               
               
                w
EOF                ;;
                *）
                echo "None operating ,Exit"
                exit 2
                ;;
                esac        fi
else
        echo "Please input new partition size（MB）,Only number."
        read Size
        Pun=`echo "$Size"|grep "[[:punct:]]+"`
                while [[ $Size -le 1 || -n $Pun ]]
                do
                        echo "Wrong try again！"
                        Size=
                        read Size
                        Pun=`echo "$Size"|grep "[[:punct:]]+"`
                done
        answer=${Size:-50}
        fdisk $Hard &> /opt/fdisk.log <<EOF
        n
       
        +${Size}M
        wEOF
fi新手，代码多有不足，欢迎各位大神多指正