How much does understanding of Linux matter in a cybersecurity career?

Hi I'm currently working towards a career in cybersecurity/software development, focused on security software such as antivirus, DRM and anticheat. Is Linux a hard requirement for this type of work?

I'm most comfortable with Windows and many of the tools I know how to use are on Windows. I can obviously use GUIs and navigate a Desktop Environment, and the terminal isn't fully alien to me, but I don't have a lot of experience using Linux. I'm not familiar with …

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