Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: They are building a shell command on a server, combining that with user input, and then executing that in a shell on the client. #shudder
This tweet contains emotions: 
fear, joy