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How to extract errors and warnings from the log file of a virtual machine hosted in VirtualBox

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Host: Centos 7 Hypervisor: VirtualBox 6.1.32 Virtual machines: One Windows Server 2016, One Linux Centos 5, Two Windows 10 Pro

I want to search for errors in the virtual machines log files. Is there command to do it? something more or less equivalent to: dmesg --level=err,warn for the linux kernel

Right now I am using: grep -E -i "err|warn|fail" VBox.log but I don't want to miss any error or warning.

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