Установка интерпретатора STk Scheme на Ubuntu Mate

awk '{
    delete fields
    for (i=1; i<=NF; i++) {
        split($i, f, /=/)
        fields[f[1]] = f[2]
    }
    # do something with fields["ipv4"], fields["mac"], fields["netbios"]
}' filename

Или, не используйте awk, используйте bash

while IFS= read -r line; do
    eval "declare $line"
    # do something with $ipv4, $mac, $netbios
done < filename