Shell Programming and Scripting

Code:

[ ! "who -m|awk '{print $1}'" = "user1" -o "user2" -o "user3" ] && echo "You are not authorized to run this script" && exit 1

is this correct ?

You have to use backticks ` to surround the who -m command. Backticks are right next to the number 1 on my laptop's keyboard. Should be for your computer too. Looks like a ' but its not. So:

Code:

 [ `who -m | awk '{print $1}'` != "user1" -o "user2" -o "user3" ] && echo "you are not..." && exit 1

Forgive me, the ! goes right before the = sign so !=. Meaning NOT EQUAL ( ! means NOT ). Please note that after the single slash ' after {print $1}' there's another backtick `. Might be hard to see.

Do you not have "whoami"? Type whoami at your shell prompt and it should tell you the current logged in user. Use that instead of the who command, save some time...

in my case user1 user2 user3 and so on will be authorized users to run this script - I should allow them and rest others who are NOt "who -m | awk '{print $1}'" the out put should not use it and exit out.

That's what that will do. It will only allow someone who is logged in with a name you've authorized to run the script, to execute the script. If the person logged in is anyone else, it will exit. So, only user1, user2, and user3 will be able to run that script without it exiting with the error.

there is a deference in whoami and who -m | awk 'Print $1}'
whoami shows me "root" and who -m shoes "user1"

ah ok. I guess I learned something. :-) So did that work for you?

No Sir - not working - I did your other tip that to key in the password and supply. I was trying to do it in real fashion like - the user I know in my group to allow the access - so who -b and I list my users against that. Which did not work.

---------- Post updated at 10:42 PM ---------- Previous update was at 04:41 AM ----------

any inputs on this please - I need set of users only to run this script based on there UNIX user names - so I need to predefine the user names with in the script so that it will ask "what's your username" question when they type in which I have approved or allowed in the script only should able to execute else exit them or it should ask for there own unix id password? how do I do this?