Shell Programming and Scripting

Hello there,
i would like to know if there is a way to limit the access of a user to certain commands....
for example, i have created a new user on my unix server but i would like to limit the user or to avoid him from executing certain commands such as to create a new file using the edit or vi command, to perform switch over in the system or even to restart the server......
is there any way to do that?

furtheremo,re how can i record all the commands that a certain user have entered?..i mean the command itself and the time of execution...

Thanks.....

Do you know about restricted shells? That may be what you want. rksh is the restricted version of ksh, and so on.

Hi there,

i have a little idea about ksh but its my first time to hear about the rksh, i am not that expert in unix...but let me ask u one question, when i add a new user to the unix server i can specify what type of shells he can use, now do u mean that i have to specify the rksh for that user and thats it?? or there is something else i have to do???

sorry if my questions look silly but i need to know these information and would be happy if u can help.

thanks again.....