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Full Discussion: No concurrent login
Top Forums UNIX for Advanced & Expert Users No concurrent login Post 33795 by Neo on Sunday 19th of January 2003 10:51:40 PM
Old 01-19-2003
You could write a simple line in the login script that looks for a lock file, something like /etc/logins/lock_your_user_id and then if it does not exist, allow the login and then create the file. This is a simple file locking mechanism that is used a lot in UNIX systems and could be used here very easily.
 

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LEARN ABOUT SUNOS

listusers

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 5.10							    18 Mar 1994 						      listusers(1)
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