Resolve domain name records that are suspended from resolution

Demand:

IDC computer room reported that a bunch of customer interface domain names have expired for the record. I need to judge that the other side of these domain names is that the customer has suspended the resolution, and those have resolution records, and then notify the customer to suspend the domain name resolution.

Sort first to remove duplicate domain names:

Cat 2.txt | sort-rn | uniq-c | awk'{print $2}'> b.txt

Look for those in the b.txt file that still have a parsing record:

For n in `cat / root/ b.txt`; do echo $n & ping-C1-I 0.1$ n-Q | grep 'PING' | grep-v' 127.0.0.1 done

The output during execution is as follows:

[1] 38765m.z3o8i.cn [1] + Done echo $n [1] 38769m.z1w4ri.cn [1] + Done echo $n [1] 38773m.yunranfa.cnPING s.cooolyi.cn (221.195.1.103) 56 (84) bytes of data. [1] + Done echo $n [1] 38835m.yunnvjie.cnPING s.cooolyi.cn (183.60.136.216) 56 (84) Bytes of data. [1] + Done echo $n [1] 38839m.yqbyiw86.cnPING s.cooolyi.cn (183.60.136.216) 56 (84) bytes of data. [1] + Done echo $n

Append the above output to the file 11.txt file

Filter out the secondary domain names that are also resolved and begin with m:

Sed-e'/ Done/ {d}'- e'/\ [1\] / {d} '11.txt | grep-B 1' PING' | grep "^ m"

Filter out secondary domain names that are also resolved, ending with .cn and .com:

[root@localhost ~] # sed-e'/ Done/ {d}'- e'/\ [1\] / {d} '11.txt | grep-B1' PING' | grep ".cn $" | head-2m.yunranfa.cnm.yunnvjie.cn [root@localhost ~] # sed-e'/ Done/ {d}'- e'/\ [1\] / {d} '11.txt | grep-B1' PING' | grep ".com $" | head-2m.vhu5j1.comm.qeiuke.com