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Java Java Basics Getting Started with Java Strings and Variables

Why does my console say -su:javac.Introductions.java: command not found when I try to run http://teamtreehouse.com/works

Console Problems

Rob Bridges
.a{fill-rule:evenodd;}techdegree seal-36
Rob Bridges
Full Stack JavaScript Techdegree Graduate 35,467 Points

I'm not exactly sure what file you are trying to run. Is that the exact line you are typing into the command prompt? In the treehouse work shop the command is java Introductions.java, no need to use a "." between javac and Introductions.java