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Accepted
Nick
Asked: 2023-06-12 17:31:11 +0800 CST

detect if zone transfer with dig succeed or not via return code

  • 772

I have script like this

CHARSET=ASCII dig domain.com AXFR > domain.com.zone

if [ "$?" = "0" ]; then
    echo "OK"
else
    echo "Something went wrong"
    
fi

However, I saw there is non complete file with line at the end

;; communications error: end of file

Is there some bug in my script or how I can "catch" this error?

shell

1 Answers

  1. Best Answer

    The exit status ($?) of the dig command does not reflect whether the zone transfer was successful or not.

    We could check the output file for the error message like that:

    CHARSET=ASCII dig domain.com AXFR > domain.com.zone

if grep -q "communications error: end of file" domain.com.zone; then
    echo "Something went wrong"
else
    echo "OK"
    gzip -9 domain.com.zone
fi
    • 2