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The failure of isql login can be managed within a Bash script by checking the exit code of the isql command. If the login fails, isql will return a non-zero exit code, signaling that an error has occurred. This can be captured using the "$?" variable.

For example:

isql -U username -P password -S server -d database
if [ $? -ne 0 ]; then
   echo "Login failed"
else
   echo "Login successful"
fi

In this script, we attempt to log in to the database using isql. If the login fails, the "$?" variable will be non-zero, and the script will print "Login failed". Otherwise, it will print "Login successful". This allows you to handle the failure of isql login appropriately within your Bash script.