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Useful commands in Linux (CentOS)
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Add a user to the Sudo Group in the Sudoers File
The easiest way to grant a user sudo rights is by adding them to the wheel group:
as root:
usermod -aG wheel username
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Find all the text files in the current directory which contain "helloo"
find ./ -name "*.txt" -exec grep -H 'helloo' {} \;