UNIX for Dummies Questions & Answers

Can someone post a "for dummies" explanation on how subshells work?

Let's say I want to get a couple of pieces of info from the /etc/passwd file and set them as variables to be echo'd back after all data is gathered. something like

Code:

for i in ${grep 5000 /etc/passwd | cut -d : -f 5}
userid=${grep 5000 /etc/passwd | cut -d : -f 3}
last=${last -l 1 | cut -c 40-55

Now I want to make it come out as this:
Username: ____ UserID: ________ last login _________

but I think if I did this command:
echo “Username: ${i}, UserID ${userid} last login: ${last}”
it would list all usernames first, then all the user ids and then all the last logins like this:
user A
user B
user C
auser
buser
cuser
date
date
date

How would I go about getting it to put like this:
Full Name: User A Username: auser last login: date
full name user b username buser last login date?

Would I do this:
echo “Username: ${account} userid ${i}, last login:${last}”?

---------- Post updated at 03:52 PM ---------- Previous update was at 03:44 PM ----------

This is the actual code I am trying to use but it isn't working - it gives me all the full names, then all the usernames and then all the last logins:

Code:

#!/bin/bash
passfile=/etc/passwd
 
for i in  $(grep 5000 ${passfile} | cut -d : -f 5)
do
 
 
        account=$(grep 5000 /etc/passwd | cut -d : -f 3)
        username=$(grep 5000 /etc/passwd | cut -d : -f 1)
        lastlogin=$(last -l 1 | cut -c 40-55
                echo Full Name:${i} Username: ${username} User ID: ${account} Last login: ${lastlogin)
done