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I just noticed today that a weird name that appeared on my teminal "rrmando2x13g" as shown in the image below. Usually only my computer name (removed in cyan) used to appear.

Does this mean its a malware or someone else has logged in to my computer?

enter image description here

Is there a way to remove this?

user0193
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    Can you verify what are Local Hostname, Hostname and Computer name on your Mac with terminal command : scutil --get LocalHostName then scutil --get HostName and scutil --get ComputerName –  Apr 26 '21 at 15:01
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    @Jean_JD both the commands --get LocalHostName and --get ComputerName gives me proper names, scutil --get HostName however results in HostName: not set – user0193 Apr 26 '21 at 15:05

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Ok So you can give a name to your HostName :

sudo scutil --set Hostname "The name you want"

You will have to give your password for this operation. And it's nor appear when you give it.

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The name on the left is the name of your user directory.

You can change the name in the system settings under Accounts & Users

On the right the name is the HostName.

You can change your host name persistently sudo scutil —set HostName YourHostname

BabyBoy
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    Changing the directory name in Accounts & Users is dangerous and can, e.g. if there is only one account on the system, block you from accessing the system. If you recommend this, please also describe the detailed steps required to avoid problems. – nohillside Apr 26 '21 at 15:53
  • I really dont have any user directory under the name rrmando2x13g. It just appeared today! – user0193 Apr 26 '21 at 16:14
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    I'm not going to say anything wrong, I mean, I'll redirect you directly to the Apple site: https://support.apple.com/en-us/HT201548 Please tell me if it was your problem. If you suspect malware, I recommend installing Malwarebytes or Combo Cleaner and scanning the system. – BabyBoy Apr 26 '21 at 18:46