Linux Init Program
http://freedownloadablebooks.blogspot.com/2008/03/linux-init-program.html
Linux Emergency Filesystems and Procedures
http://freedownloadablebooks.blogspot.com/2008/03/linux-emergency-filesystems-and...
Making and Managing Linux Filesystems
http://freedownloadablebooks.blogspot.com/2008/03/making-and-managing-linux-filesystems...
Accessing Removable Media
http://freedownloadablebooks.blogspot.com/2008/03/accessing-removable-media.html
Linux System Setup
http://freedownloadablebooks.blogspot.com/2008/03/linux-system-setup.html
Linux Tips
http://freedownloadablebooks.blogspot.com/2008/03/linux-tips.html
Basic Liinux Devices
http://freedownloadablebooks.blogspot.com/2008/03/basic-liinux-devices.html
Setting Linux Time
http://freedownloadablebooks.blogspot.com/2008/03/setting-linux-time.html
Linux Help
http://freedownloadablebooks.blogspot.com/2008/03/linux-help.html
Finding Files in Linux
http://freedownloadablebooks.blogspot.com/2008/03/finding-files-in-linux.html ...

Dear all,

this is what i have read in the book ubuntu linux unleashed,

if you have a desire to severly restrict what a user can do, you can
provide him with a restricted shell. to run a restricted bash shell,
you would use the -r option

ex:- bash -r

then try to do something that you could do as a regular user, such as
ls -a,

you will then see

bash: ls: no such file or directory

now my question is suppose i have my shell restricted, how to make it
back un restricted ?

Hello everyone,

I have this simple bash script that reads from standard input and executes
some work depending on the input that it has read. The input lines are
meant to be in the form of a command followed by an argument.

#!/bin/bash

read input

#these two lines divide input in a first word and the rest; are they safe?
command=`echo ${input%%%% *}`
rest=`echo ${input#* }`

case $command in

print)
echo $rest
;;

*)
echo "wrong command"
;;

esac

Is is possible for the user to provide something to the standard input and
make this script do something different from what it was meant?

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