The shell script function determines whether the IP address entered conforms to the rule

#判断IP是否符合标准规则function  judge_ip () {         #这里local  $1 error, with 2 >/dev/null Shield off error, no effect on the output results         local $1 2>/dev/null         TMP_TXT=/tmp/iptmp.txt         echo $1 > ${tmp_txt}        ipaddr= ' grep  -Eo  ' ([0-9]{1,3}\.) {3} [0-9] {1,3} '  ${tmp_txt} '          #判断有没有符合 ip  of the ***.***.***.*** rule        if [ ! -z  "${ipaddr}"  ];then                 local j=0;                 # Loop to detect if the values before each point meet the requirements                  for&nbsp ((i=1;i<=4;i++))                  do                         local ip_num= ' echo  "${IPADDR}"  |awk -F.   "{print $" $i "}" '                           #判断IP_NUM是否在0与255之间                           if [  "${ip_num}"  -ge 0 -a  "${ip_num}"  -le 255 ];then                                   ((j + +));                         else                                  return 1                          fi                 done                # The value of J to determine whether to continue matching rules, loop four times, if all are correct j=4.                 if [  "$j"  -eq 4 ];then                         # Verify that the IP address you want to enter is &NBSP;&NBSP;&Nbsp;         read -n 1 -p  "The IP you entered is ${ipaddr}, Confirm input: y|y; re-enter: R|r: " ok            case $ {ok} in                         y|y)  return 0;; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;R|R)   return 1;;                 *)  return  1;;             esac                 else                          Return 1                fi         else                &NBSP;RETURN&NBSP;1&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;FI}

Call Method:

Read-p "To set the IP example for" 192.168.1.1 ", enter:" Ipaddrsjudge_ip "${ipaddrs}"; I= ' echo $? ' #循环直到输入正确的IP为止until ["$i"-eq 0];d Oecho -E "\033[31m you entered the wrong Ip:${ipaddrs} ====>>>>\033[0m" Read-p "re-enter the IP, example" 192.168.1.1 ", enter:" Ipaddrsjudge_ip " ${ipaddrs} "; I= ' echo $? ' Done

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The shell script function determines whether the IP address entered conforms to the rule