自動建立分區的shell指令碼

題目：用shell指令碼自動添加分區，已實現功能如下：

1.檢查擴充分區是否，且是否可以添加，如果可以則把所有的剩餘空間設定為擴充分區

2.當擴充分區存在，則輸入要添加的分區大小，僅接受大於1的正整數

代碼如下：

#!/bin/bashHard='/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 -1if [[  -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 $Hard &> /opt/fdisk.log <<EOFne$Sdanum        w    EOF                ;;                *)                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 $Hard &> /opt/fdisk.log <<EOF                n                e                                                      wEOF                    ;;                *)                echo "None operating ,Exit"                exit 2                ;;                esac            fielse        echo 'Please input new partition size(MB),Only number.'        read Size        Pun=`echo "$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        w    EOFfi