I'm trying to grep the IPs by using this command but I get an error No such file or directory.

cat sub.txt | xargs dig {} short | grep -Po ([0-9]){2,3}(\\.[0-9]{1,3}){3} 

CodePudding user response：

This should do the complete job:

dig -f sub.txt  short

See: man dig

CodePudding user response：

I'm just adding " double quotation after the -Po and now it works ^^

grep -Po "([0-9]){2,3}(\.[0-9]{1,3}){3}"