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I changed the default username using usermod. and now whenever I type a sudo command it requires a password. I do it only when it is the first time I type sudo. further it does not require any password. I do not understand it.

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    What is your actual issue or question? – arielnmz May 3 '17 at 14:52
  • This is a general *nix question, it is not specific to the Raspberry Pi. – joan May 3 '17 at 15:00
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This has nothing to do with changing the user name, it's default sudo behaviour. sudo caches your credentials so you don't get asked if you do another sudo within a short range of time (15 minutes is default). If you don't enter another sudo command for 15 minutes, you'll get prompted again. Or do sudo -k to reset the credentials immediately.

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  • fixed with visudo – aguirab May 4 '17 at 7:57
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fixed with visudo line pi ALL=(All) NOPASSWD:ALL change : pi --> nex $USER thanks

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