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Operating Systems Linux Red Hat Limit root user of SSH logins Post 302854329 by Scott on Tuesday 17th of September 2013 07:19:49 AM
Old 09-17-2013
I have no idea why you'd want to do that.

There are various ways to restrict root access to varying degrees, but not by just the number of SSH logins (and even that would be easily circumventable with, for example, su).
 

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listusers(1)							   User Commands						      listusers(1)

NAME
listusers - list user login information SYNOPSIS
listusers [-g groups] [-l logins] DESCRIPTION
Executed without any options, this command lists all user logins sorted by login. The output shows the login ID and the account field value from the system's password database as specified by /etc/nsswitch.conf. OPTIONS
The following options are supported: -g groups Lists all user logins belonging to group, sorted by login. Multiple groups can be specified as a comma-separated list. -l logins Lists the user login or logins specified by logins, sorted by login. Multiple logins can be specified as a comma-separated list. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ |ATTRIBUTE TYPE ATTRIBUTE VALUE | |Availability SUNWcsu | +-----------------------------------------------------------+ SEE ALSO
nsswitch.conf(4), attributes(5) NOTES
A user login is one that has a UID of 100 or greater. The -l and -g options can be combined. User logins will only be listed once, even if they belong to more than one of the selected groups. SunOS 5.11 18 Mar 1994 listusers(1)
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