Shell Programming and Scripting

#!/usr/bin/ksh
for i in `cat host.txt`
do
        ssh $i
if [[ $? -eq 0 ]] then
echo "Login to $i is succesful"
        df
                if [[ $? -eq 0 ]] then
                echo "Df is successful"
                else
                echo "DF got stucked"
                fi
else
echo "Not able to Login to $i"

fi
done

#!/usr/bin/ksh
while read line
do
ssh $line <<EOF # Use a 'here document' to pass a sequence of commands to the ssh connection
if [[ $? -eq 0 ]] then
	echo "Login to $line was succesful"
	df
		if [[ $? -eq 0 ]] then
			echo "df is successful"
		else
			echo "DF got stucked"
		fi
else
	echo "Not able to Login to $i"
fi
exit
EOF
done < hosts.txt

Pseudo-terminal will not be allocated because stdin is not a terminal.

"Login to $line is successfult"
"DF is executed successfulyy at $line"