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Linux command: Find current username and userid

https://pixabay.com/en/who-question-information-mark-text-2549178/ by https://pixabay.com/en/users/RossMannYYC-5748266/

Find current username

$ whoami

Using id command

$ id -un

Find current userid

# id

Using USER variable

$ echo $USER

Extract from environment settings

$ env | grep USER
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