Keep users history.

Set the default shell that users use to bash.
http://stanlo-solaris.blogspot.com/search/label/useradd


Next add this to your /etc/profile file

HISTTIMEFORMAT='%F %T '
export HISTTIMEFORMAT

Then create a .bash_logout script for the user.
#----------------------------------------------------------
#               Record bash history
#
#       Written : Stan Lovisa
#       Date    : 29-01-2010
#       Mod     :
#
#----------------------------------------------------------
TSATMP=$(date +%Y%M%d-%T)
if [ ! -d ~/.hist ]
then
        mkdir ~/.hist
fi
who am i > ~/.hist/$$.bash_history.${TSATMP}
history >> ~/.hist/$$.bash_history.${TSATMP}
banner bye

Each time the user logs out a history file is created in $HOME/.hist

Sample output:

480  2011-06-21 14:44:24 lr
481  2011-06-21 14:44:29 l tmp/
482  2011-06-21 14:44:35 l dat
483  2011-06-21 14:44:42 cd dat
484  2011-06-21 14:44:44 c
485  2011-06-21 14:44:44 l
486  2011-06-21 14:44:50 l 2011/
487  2011-06-21 14:44:56 ls 2011/
488  2011-06-21 14:45:07 cd ../..
489  2011-06-21 14:45:09 l tmp/
490  2011-06-21 14:45:17 lf tmp
491  2011-06-21 14:45:25 lf /tmp
492  2011-06-21 14:46:05 digs -x 172.19.1.50
493  2011-06-21 18:06:09 . s.bashrc
494  2011-06-21 18:06:20 ssh stl@suse-dell
495  2011-06-22 08:04:00 . s.bashrc
496  2011-06-22 08:04:00 c
497  2011-06-22 08:04:03 history
498  2011-06-22 08:04:13 cd /etc/
499  2011-06-22 08:04:15 vi profile
500  2011-06-22 08:07:38 cd
501  2011-06-22 08:07:41 vi .profile
502  2011-06-22 08:07:53 l
503  2011-06-22 08:07:56 lf
504  2011-06-22 08:08:10 vi .bash_logout
505  2011-06-22 08:11:41 history