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simulate linux shell using script

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# 1  
Old 09-10-2010
simulate linux shell using script
hi guys

I was requested to create a script to simulate a linux shell so when the user opens linux he will get my linux menu with some options and one of those is a simulated linux shell

this is my code

Code:
#!/bin/ksh
while [ "$whichcmd" != end ]
     do
     read whichcmd?"Enter Command: "
     $whichcmd
     done
     whichcmd=0

but commands like these ones won't work

Code:
/sbin/ifconfig -a | less
/sbin/ifconfig > ip

it looks like when using | or > or similar characters my simulated command line won't work

any idea how to improve this simulated command line?

thanks a lot
# 2  
Old 09-10-2010
Try it with eval, the script should be like:
Code:
#!/bin/sh

while true
do
  read -p "Enter Command: " whichcmd
  if [ "$whichcmd" = "end" ]
  then
    exit
  fi
  eval "$whichcmd"
done

This User Gave Thanks to Franklin52 For This Post:
kopper
# 3  
Old 09-10-2010
Code:
#!/bin/ksh
while [ "$whichcmd" != end ]
     do
     read whichcmd?"Enter Command: "
     eval $whichcmd
     done
     whichcmd=0

# 4  
Old 09-10-2010
Note that eval isn't really limited, so if this is supposed to be any sort of secure or restricted shell, not a good idea. Not too hard to devise a way to do anything up to the limits of the login's permissions.
# 5  
Old 09-10-2010
I hate to ask this question, but what is the purpose of the simulated Linux shell? What does it accomplish if you are going to allow a user to type any command and the simulated shell then executes that command?
# 6  
Old 09-10-2010
Quote:
Originally Posted by fpmurphy
I hate to ask this question, but what is the purpose of the simulated Linux shell? What does it accomplish if you are going to allow a user to type any command and the simulated shell then executes that command?
my customer is trying to follow the PCI compliance on their linux servers so they asked to do that.....
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