Shell Regular expression authentication IP address

This article mainly introduced the shell regular expression authentication IP address, this article has given several methods, and gives the realization code separately, needs the friend to be possible to refer to under

Multiple IP on this machine

The code is as follows:

Ifconfig | awk '/inet/{print $} ' | Awk-f: ' {print $} '

First, use this first.

The code is as follows:

Checkipaddress ()

{

echo $ >/tmp/tmpserverip

echo $ |grep "^[0-9]{1,3}. [0-9] {1,3}. [0-9] {1,3}. [0-9] {1,3}$ ">/dev/null

If [$? = 1]; Then

Return 1

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)

For the loop in $a $b $c $d

Todo

If [$loop-ge 255] | | [$loop-le 0]; Then

Return 2

Fi

Done

Fi

return 0

}

At first, refer to the following

The code is as follows:

grep "^" ([01]?dd?| 2[0-4]D|25[0-5]). ([01]?dd?| 2[0-4]D|25[0-5]). ([01]?dd?| 2[0-4]D|25[0-5]). ([01]?dd?| 2[0-4]D|25[0-5]). $ "

Input IP, check whether it is satisfied with the IP writing specification, that is, can not be greater than 255, can not have letters, and other punctuation, refer to the Internet, they made a following, make a mark!@

The code is as follows:

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

}