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Just got a new mac and I've just realised that my name is all lower case, having a little OCD I must rectify this so that my name has the first character capitalised.

How can I do this?

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Make sure to have a working backup before performing this.

  1. Enable root user, log out of your account and log in to the root account.

  2. In System Preferences, delete your account by selecting it and clicking the - button.

  3. Select to not change your home folder.

  4. Go to /Users in Finder and rename the account folder how you wish (deleting the account should have appended (Deleted) to the name - remove this).

  5. Create a new account in System Preferences as Administrator with a short name matching the renamed home folder.

  6. When informed that the home folder already exists, select to use the existing home folder.

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You can change your user name very easily just going to Applications -> System Preferences -> Users & Groups...

If you want to change the name of your computer in your network as well, you should go to Applications -> System Preferences -> Sharing...

But, if what you want is to change your account name (i.e., the name of your home folder), that's a bit more complex. According to this article, you could do this workaround (Mac OS X v10.5 or later):

  1. Enable the root user.
  2. Log in as root.
  3. Navigate to the /Users folder.
  4. Select the Home folder with the short name you want to change, and rename it just like you would rename any folder. Keep in mind that the account name must be all lowercase, with no spaces, contain only letters or contain a mix of letters and numbers, and it cannot be the same as an existing user's Full Name.
  5. Use the Users & Groups pane (Accounts pane in Mac OS X v10.6.8 or earlier) in System Preferences to create a new user with the Account name or Short Name that you used in the previous step.
  6. Click OK when "A folder in the Users folder already has the name 'account name'. Would you like to use that folder as the Home folder for this user account?" appears. Note: This will correct the ownership of all files in the Home folder, and avoid permissions issues with the contents.
  7. Choose Log Out from the Apple menu.
  8. Log in as the newly created user. You should be able to access all of your original files (on the desktop, in Documents, and in the other folders of this Home).
  9. After verifying that your data is as expected, you can delete the original user account via the Users & Groups pane (Accounts pane in Mac OS X v10.6.8 or earlier).
  10. Disable the root user.
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