[Bug 2385] New: ssh does not document relative priorities among various methods of specifying login name

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2385

            Bug ID: 2385
           Summary: ssh does not document relative priorities among
                    various methods of specifying login name
           Product: Portable OpenSSH
           Version: 6.8p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Documentation
          Assignee: unassigned-bugs at mindrot.org
          Reporter: jjelen at redhat.com

Created attachment 2596
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2596&action=edit
proposed patch

+++ This bug was created as a clone from Red Hat bugzilla 1196989 +++

Description of problem:
I am aware of following methods of specifying the login name to the ssh
program:

1. /etc/ssh/ssh_config
2. ~/.ssh/config
3. -l option to ssh 
4. user at hostname syntax

The SSH(1) man page does not clarify behaviour in case multiple of the
above options are use simultaneously. Even the ssh -vv output does not
log any message in such cases.

[...]

--- Additional comments ---

>From my POV, it would be useful to mention these priorities in
documentation. Also I would mention that if nothing defined, username
is obtained from current user. And where does live priority of -o
switch.

Based on my experience and observation, the exhaustive explanation of
priorities would look like this:

     1.   user specified before @ character in hostname string
     2.   login_name specified using -l switch
     3.   User option provided as a parametr to -o switch
     4.   User option in matching Host block from per-user config
~/.ssh/config
     5.   User option in matching Host block from systemwide config
/etc/ssh/ssh_config
If there is nothing from above specified, username on local terminal is
used.

(as attached documentation source in path, this is for readability)

Feel free to comment if I missed something or you would spell it
better. It is not critical, but nice to have thing.

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