i tested this with my ubuntu perfect webserver setup. but i believe it's same steps to install on any linux.
wget http://downloads.sourceforge.net/project/lshell/lshell/0.9.5/lshell-0.9.5.tar.gz tar xvfz lshell-0.9.5.tar.gz sudo python setup.py install chsh -s /usr/bin/lshell RESTRICTEDUSERNAME
o, btw. it python script. so make sure python is installed.
simple, fast, easy.
after that, edit /etc/lshell.conf to configure lshell to suite your need.
the most important (for me) is the allowed and forbidden list of commands.
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