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Top Forums UNIX for Advanced & Expert Users How to get a login name of a person who used 'su' and act with different user-name? Post 302285840 by alex_5161 on Monday 9th of February 2009 08:34:21 PM
Old 02-09-2009
fimbo - or I could not understand what you advice, or I did not explain well what I need to have.
You are right, ps -ef could drive me to original process - completely understand PID and PPID relation.

But in our sistem the 'su' command is not visable.
So, how I can know who is under the 'support' login?

One person start a background script and closed the session.

After some period of time script need to display a message, but original session is not available.
But it must to be someone else under the same 'support' id, logged with 'su'

Using the 'write' command is not possible - the 'write' do not see the person after the 'su' - it sais: the 'support' person is not logged.
But I see many processes of the 'support' person and can't write a message to that user.

The 'ptree' is available on this system, but there is no 'su', also
See example.
I have logged in the system with my log ID, and 'su' for the same id (I do not have any other id available).
I have start 'tail -f ..' to recognize process
See the part of 'ptree':
Code:
            17175 more -s /tmp/mpwMaqGH
  18599 in.telnetd
    18602 -ksh
      18662 bash
        18727 ksh
          18766 bash
            18859 tail -f tst.sh
746   /usr/lib/nfs/statd

...
I think the ptree is usefull to see, but to follow to the originating PID from script is not comportable.
 

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ptree(1)																  ptree(1)

NAME
ptree - print process trees SYNOPSIS
/usr/bin/ptree [-a] [-c] [-z zone] [pid | user] ... ptree prints the process trees containing the specified pids or users, with child processes indented from their respective parent pro- cesses. An argument of all digits is taken to be a process-id, otherwise it is assumed to be a user login name. The default is all pro- cesses. The following options are supported: -a All. Print all processes, including children of process 0. -c Contracts. Print process contract memberships in addition to parent-child relationships. See process(4). This option implies the -a option. -z zone Zones. Print only processes in the specified zone. Each zone ID can be specified as either a zone name or a numerical zone ID. This option is only useful when executed in the global zone. The following operands are supported: pid Process-id or a list of process-ids. ptree also accepts /proc/nnn as a process-id, so the shell expansion /proc/* can be used to specify all processes in the system. user Username or list of usernames. Processes whose effective user IDs match those given are displayed. Example 1: Using ptree The following example prints the process tree (including children of process 0) for processes which match the command name ssh: $ ptree -a `pgrep ssh` 1 /sbin/init 100909 /usr/lib/ssh/sshd 569150 /usr/lib/ssh/sshd 569157 /usr/lib/ssh/sshd 569159 -ksh 569171 bash 569173 /bin/ksh 569193 bash The following exit values are returned: 0 Successful operation. non-zero An error has occurred. /proc/* process files See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ The human readable output is Unstable. The options are Evolving. gcore(1), ldd(1), pargs(1), pgrep(1), pkill(1), plimit(1), pmap(1), preap(1), proc(1), ps(1), ppgsz(1), pwd(1), rlogin(1), time(1), truss(1), wait(1), fcntl(2), fstat(2), setuid(2), dlopen(3C), signal.h(3HEAD), core(4), proc(4), process(4), attributes(5), zones(5) 11 Oct 2005 ptree(1)
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