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sudo useradd user1

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sudo useradd -m user1

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sudo useradd -m -s /bin/bash user1

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sudo passwd user1

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sudo userdel user1

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sudo userdel -r user1

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sudo usermod -s /bin/bash user1

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sudo groupadd group1

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sudo groupdel group1

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sudo usermod -a -G group1 user1

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chmod u=r file1

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chmod g=rw file1

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chmod o=x file1

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Linux Commands – useradd(8) Manual Page.

Linux Commands – userdel(8) Manual Page.

Linux Commands – usermod(8) Manual Page.

Linux Commands – groupadd(8) Manual Page.

Linux Commands – groupdel(8) Manual Page.

Linux Commands – groupmod(8) Manual Page.

Linux Commands – chmod(1) Manual Page.

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