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Which is correct:

I can't login?
I can't log in?

I'm confused if that's with a space or no space?

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even more interesting, the other day I was thinking about login to vs. log into vs. log in to –  Cruncher Apr 3 at 20:11

3 Answers 3

Good question.

There are two words! If you say 'log in' it is generally a verb. On the other hand, if you say 'login' it generally means a noun.

WordWeb describes this -

log in (v) - Enter a computer.
login (noun) - A combination of a user's identification and password used to enter a computer, program, network, etc.

So, in your case, you probably want a verb so it's I cannot log in.

If you want to play with words here, you may say...

"I don't have login credentials (id and password) to log in!"

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Nice! Thanks, You've been so helpful. –  Rolan Apr 3 at 7:14
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That said, I've noticed that use of "login" as a verb is growing. I don't think we'll be able to call it incorrect for long. –  Steve Jessop Apr 3 at 10:57
    
@SteveJessop that's the beauty of English. It adopts changes just like that. Who knew Google will be a verb google today? –  Maulik V Apr 3 at 10:59
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Same thing as with "setup" and "set up". –  Panzercrisis Apr 3 at 17:43
    
@Panzercrisis I agree...thanks for adding this. It puts value –  Maulik V Apr 4 at 5:13

To test verbs for spaces, try an example in the 3rd person singular. For example:

"He logs in to the computer."  (Not "He logins to the computer.".)

To test nouns for spaces, try a plural example. For instance:

"All the logins were invalid."  (Not "All the logs in were invalid.".)
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While that may be true, I'm not sure how helpful that would be to an Engish Language Learner, for whom, presumably, neither form would seem to be natural… –  Bill Michell Apr 3 at 13:30

I originally intended this to be a comment, but it was too long, so here goes…

Dropping spaces from phrases to make new words used to be common only to languages like German, not English. However, limitations of some (most) computers in the late 20th Century meant that a generation of people got used to commands that could have no spaces or other special characters in them. The command to "log in" to some types of computer common in the late 70s and 80s was "login" for example, and this restriction has lead to "login" being a common alternate spelling for "log in", at least amongst computer people of a certain age, who are still influential in the tech world.

Ordinary people, who were never, or only lightly, exposed to computers in the late 20th Century, and who don't have to communicate, would almost always use "log in" to talk about what they have to do to identify themselves to a computer system.

IT people, heavily influenced by people who grew up through the computer revolution, or who were part of it themselves, would use "login" to describe the specific technological mechanism, or things related to it. So I'd say "login" was more of an adjective than a noun. "Login" process, "login" program, "login" credentials. The noun usage described on WordWeb, described in @Maulik_V's answer, is then just an abbreviation of login credentials.

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I started learning coding by teaching myself QBasic. I still type "goto" instead of "go to". I know it's wrong, but it's not worth the mental effort to retrain my fingers; so I just add it to the list of my little quirks. –  GamerJosh Apr 3 at 15:35

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