how to run a command line with another user without prompts for password

Shell Programming and Scripting
1

Hi, I'm writing a script,
in the script I need to use tcpdump to capture some packets
however it needs root priviledge
my computer is configured by school and I have no real root priviledge

so I can't use sudo on my computer,like
Code:
sudo tcpdump ......
I have to use a limited root username su4098
Code:
su su4098
and then use user su4098 as the root, with su4098 I can use tcpdump

since I want to run the tcpdump command in a script, I dont want to input the password mannualy

how can I run tcpdump command with su4098 without mannually input the password
or specifically how can I change my username to su4098 without mannually inputing the password?

thanks!

2

To do that without a password, ask your administrator to configure sudo to allow that user to use that command without a password.