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输入ip，检查其是否满足的ip书写规范，即不能大于255，不能有字母，和其他标点，参考网上的，自己搞了个如下，做个标记！@
判断方法：
echo -n 'Enter the Server-ip:'
&&&&&&& read BISSip
&&&&&&& echo $BISSip & /tmp/tmpserverip
&&&&&&& echo $BISSip|grep &^[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}$& & /dev/null
&&&&&&& num=$?
&&&&&&& if [ $num = 1 ]
&&&&&&& then
&&&&&&&&&&&&&&& echo error ip,please enter correct
&&&&&&& else
&&&&&&& a=$(cut -d. -f1 /tmp/tmpserverip)
&&&&&&& b=$(cut -d. -f2 /tmp/tmpserverip)
&&&&&&& c=$(cut -d. -f3 /tmp/tmpserverip)
&&&&&&& d=$(cut -d. -f4 /tmp/tmpserverip)
&&&&&&&&&&&&&&& if [ $a -ge 255 ]||[ $a -le 0 ]
&&&&&&&&&&&&&&& then
&&&&&&&&&&&&&&&&&&&&&&& echo a:error ip
&&&&&&&&&&&&&&& else
&&&&&&&&&&&&&&&&&&&&&&& echo 1 & /tmp/jack
&&&&&&&&&&&&&&&& fi
&&&&&&&&&&&&&&& if [ $b -ge 255 ]||[ $b -lt 0 ]
&&&&&&&&&&&&&&& then
&&&&&&&&&&&&&&&&&&&&&&& echo b:error ip
&&&&&&& else
&&&&&&&&&&&&&&&&&&&&&&& echo 1 &&/tmp/jack
&&&&&&& fi
&&&&&&& { if [ $c -ge 255 ]||[ $c -lt 0 ]
&&&&&&&&&&&&&&&& then
&&&&&&&&&&&&&&&&&&&&&&&& echo c:error ip
&&&&&&&&&&&&&&& else
&&&&&&&&&&&&&&&&&&&&&&& echo 1 &&/tmp/jack
&&&&&&&&&&&&&&&&&&& fi
&&&&&&&& }
&&&&&&&& { if [ $d -ge 255 ]||[ $d -le 0 ]
&&&&&&&&&&&&&&& then
&&&&&&&&&&&&&&&&&&&&&&& echo d:error ip
&&&&&&&&&&&&&&& else
&&&&&&&&&&&&&&&&&&&&&&& echo 1 && /tmp/jack
&&&&&&&&&&&&&&& fi
&&&&&&&& }
参考知识库
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