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Full Discussion: Number of times a user is "connected"?
Top Forums Shell Programming and Scripting Number of times a user is "connected"? Post 302473563 by jim mcnamara on Sunday 21st of November 2010 11:00:52 AM
Old 11-21-2010
Are you worried that other users are doing bad things on your computer? Trying to monitor interactively (what you are asking) means you have to sit 24 hours a day and look at other processes.

This will give you what you just asked for, if I understood:
Code:
who | awk 'arr[$1]++;  END{for(i in arr){print i, arr[i] }}'

I don't think that is what you want to do. There are other solutions. What kinds of processes are you worried about? By that I mean are they internet connections, telnet connections, ssh connections, ftp connections....?

As a very general apporach I would learn about and install snort, and learn how to set up accounts for other users so they are restricted - like a restricted shell, or a chroot jail.
You have a lot of reading.....

Snort :: Home Page

Restricted shells
Restricted Shells

chroot jail for sftp and ftp howto:
https://help.ubuntu.com/community/BasicChroot
 

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LEARN ABOUT LINUX

times

TIMES(P)						     POSIX Programmer's Manual							  TIMES(P)

NAME

       times - write process times

SYNOPSIS

       times

DESCRIPTION

       The  times  utility  shall  write  the accumulated user and system times for the shell and for all of its child processes, in the following
       POSIX locale format:

	      "%dm%fs %dm%fs
%dm%fs %dm%fs
", <shell user minutes>,
		  <shell user seconds>, <shell system minutes>,
		  <shell system seconds>, <children user minutes>,
		  <children user seconds>, <children system minutes>,
		  <children system seconds>

       The four pairs of times shall correspond to the members of the <sys/times.h> tms structure (defined  in	the  Base  Definitions	volume	of
       IEEE Std 1003.1-2001, Chapter 13, Headers) as returned by times(): tms_utime, tms_stime, tms_cutime, and tms_cstime, respectively.

OPTIONS

       None.

OPERANDS

       None.

STDIN

       Not used.

INPUT FILES

       None.

ENVIRONMENT VARIABLES

       None.

ASYNCHRONOUS EVENTS

       Default.

STDOUT

       See the DESCRIPTION.

STDERR

       The standard error shall be used only for diagnostic messages.

OUTPUT FILES

       None.

EXTENDED DESCRIPTION

       None.

EXIT STATUS

       Zero.

CONSEQUENCES OF ERRORS

       Default.

       The following sections are informative.

APPLICATION USAGE

       None.

EXAMPLES

	      $ times
	      0m0.43s 0m1.11s
	      8m44.18s 1m43.23s

RATIONALE

       The times special built-in from the Single UNIX Specification is now required for all conforming shells.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Special Built-In Utilities

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								  TIMES(P)
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