how do i use echo command to enter ID, first name and last name? but ID auto generation.

how do i use echo command to enter ID, first name and last name? but ID auto generation and data input file

ouput should be:
1 : jane : su
2 : michale : tran

Where do you intend to get this data from?

echo '1 : jane : su\n2 : michale : tran'

Is an example...if you're typing it all out by hand...

no
i am doing exercise in class: use shell script to write code enter ID, first name, last name and give it into file (note: ID auto generation)

use looping? and how do it