Check Linux Environment Variable Value

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Check if a Linux environment variable is set etc.

e.g. to find the default EDITOR

$ printenv | grep EDITOR

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removing docker compose containers and images using rmi command

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When assigning a user’s secondary group, how to force this group assignment to take effect without logging out all running sessions

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Tips on using the minimal mistakes jekyll theme this website is built with

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e.g. after setting environment variable in ~/.bashrc, without having to logout/login or close/re-open terminal