[Bug 2542] New: Conflicting usernames by -l, -o user, user@ - it's not clear which one is used

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2542

            Bug ID: 2542
           Summary: Conflicting usernames by -l, -o user, user@ - it's not
                    clear which one is used
           Product: Portable OpenSSH
           Version: 6.7p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: gbajson at gmail.com

Hi,
I couldn't find any description of the rule for choosing a right
username when many usernames are provided from the command line/config
file:

It seems that usernames provided with -l and ...@ override the ones
from config and "-o user", and the last one is chosen.
I am not sure if this is a documentation issue or a bug.


Examples:
---------

1. "-o" overrides .ssh/config
-----------------------------
gbajson at server1:~$ cat .ssh/config  
Host localhost                      
    user=user_config

gbajson at server1:~$ ssh -o user=user-o localhost   
user-o at localhost's password:                      


2. "-l" and "@" override "-o user"
----------------------------------
gbajson at server1:~$ ssh -l user_minus_l localhost  
user_minus_l at localhost's password:                

gbajson at server1:~$ ssh user_at at localhost 
user_at at localhost's password:            


3. The last username is chosen when, both "-l" and "@" are provided
-------------------------------------------------------------------
gbajson at server1:~$ ssh user_at at localhost -l user_minus_l    
user_minus_l at localhost's password:                          

gbajson at server1:~$ ssh -l user_minus_l user_at at localhost
user_at at localhost's password:                           


Kind regards,
Grzegorz

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