I want to get the IP when I use wget command to request a domain name.
If a request fails.I will record the IP of the request this time.
I can't use "ping" command get the IP,because the IP maybe different every time.
I want to use Shell Script to do this.
wget fails, it terminates with non-zero exit status, and the errors are written to the standard error descriptor (2).
So you can check the exit code (
$? variable), and parse the strings written to the standard error:
url='http://stackoverflow.com/users/edit/1646322' output=$( wget "$url" 2>&1 ) if [[ $? -ne 0 ]]; then printf '%s' "$output" | \ perl -ne '/^Connecting to .*\|([^\|]+)\|/ and print $1' fi