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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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times(1)                                                           User Commands                                                          times(1)

NAME
times - shell built-in function to report time usages of the current shell SYNOPSIS
sh times ksh times DESCRIPTION
sh Print the accumulated user and system times for processes run from the shell. ksh Print the accumulated user and system times for the shell and for processes run from the shell. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
ksh(1), sh(1), time(1), attributes(5) SunOS 5.10 15 Apr 1994 times(1)
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