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Can I create a user without specifying a login name, and let GID used for it's login name? I read the man useradd(8), but this command seems to require a login name be set.

Any GUI way or script workaround would be appreciated.

My box is CentOS 6.4.

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Why would you want to do this? Why not just use the GID as the user name? What are you trying to achieve? – terdon May 28 '13 at 11:56
No it's not possible but you can hide the username at GDM (GNOME Display Manager)... – max May 28 '13 at 12:26
Hi! Keltari. Thanks for correcting my silly english mistakes. – shuji.koike May 28 '13 at 15:13
But I did ment "CUI" way. not a GUI like involving GNOME. – shuji.koike May 28 '13 at 15:15

No it's not possible to create a user without providing a username.

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As above. If you think about it, it does not make sense how can you create a user without a username. Imagine having a nameless person. The closest thing to have a blank username is actually to have a "space" as a username.. assuming the OS is willing to accept that... (and to be honest, I really doubt they will accept that) – Darius May 28 '13 at 14:51

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