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Not to disparage your masters degree ideas, but a "two node cluster" seems more like a high school level computer science project in the year 2017, or at best an undergraduate degree project.

My...

The reply to your "How many days" question depends, primarily, on the number of nodes in the cluster, does it not?

#!/bin/sh

while read LINE
do
echo useradd "$LINE" -d /home/$LINE
done < data.txt

If that doesn't work please tell me in what way it didn't work, not just that it didn't.

May i ?
#!/bin/bash

while read LINE
do
echo useradd "$LINE" -d /home/$LINE
done < $1

Execute it as
./script.sh data.txt

Code tags for code please.

while read LINE
do
echo useradd "$LINE" -d /home/$LINE
done < data.txt

Remove the echo once you've tested and are sure it does what you want.