LINUX SHELL編程急!！！！！！！！！！！！有追加分呀！！！！

#!/bin/bash

i=9

until [ $i -le 0 ] # 當i<= 0時停止循環

do

let j=9-i

until [ $j -lt 0 ] # 當j<0時停止循環

do

printf $j

let j=j-1

done

printf "\n"

let i=i-1

done

(2)

#!bin/bash

echo "hello world!"

shutdown now

(3)

#!/bin/bash

ifconfig eth0 192.168.1.100 up

route add default gw 192.168.1.1 eth0

#DNS應在/etc/resolv.conf裏面修改

#這裏給壹個方法，不推薦

echo "nameserver 202.12.34.56" > /etc/resolv.conf