shell script ssh command not working - linux

Question

I have a small list of servers, and I am trying to add a user on each of these servers. I can ssh individually to each server and run the command.
sudo /usr/sbin/useradd -c "Arun" -d /home/amurug -e 2014-12-12 -g users -u 1470 amurug
I wrote a script to loop through the list and run this command but I get some errors.
#!/bin/bash
read -p "Enter server list: " file
if [[ $file == *linux* ]]; then
for i in `cat $file`
do
echo "creating amurug on" $i
ssh $i sudo /usr/sbin/useradd -c "Arun" -d /home/amurug -e 2014-12-12 -g users -u 1470 amurug
echo "==============================================="
sleep 5
done
fi
When I run the script it does not execute the command.
creating amurug on svr102
Usage: useradd [options] LOGIN
Options:
What is wrong with my ssh crommand in my script?

Answer 1

Try this script:
#!/bin/bash
read -p "Enter server list: " file
if [[ "$file" == *linux* ]]; then
while read -r server
do
echo "creating amurug on" "$server"
ssh -t -t "$server" "sudo /usr/sbin/useradd -c Arun -d /home/amurug \
-e 2014-12-12 -g users -u 1470 amurug"
echo "==============================================="
sleep 5
done < "$file"
fi
As per man bash:
-t
Force pseudo-tty allocation. This can be used to execute arbitrary screen-based programs on a remote which can be very useful, e.g. when implementing menu services. Multiple -t options force tty allocation, even if ssh has no local tty.