Add a directory to your PATH
As it's a recurring question, here is how to add one or more directories to your PATH (on openSUSE, but applies more or less to other distributions as well). Note that I assume you're using bash as your shell.
First of all, PATH is an environment variable which is set when you log in, by a set of configuration files that augment it. Environment variables are marked as "export" and are inherited to subprocesses (e.g. if you start ls from your shell, the ls process will inherit all the exported variables from the shell process).
On login (graphical through KDM, GDM or XDM, or on the console), the sequence of shell configuration files read more or less as follows (slightly simplified):
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