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From 'man bash':
PATH
The search path for commands. It is a colon-separated list of directories in which the shell looks for commands (see COMMAND EXECUTION below). A zero-length (null) directory name in the value of PATH indicates the current directory. A null directory name may appear as two adjacent colons, or as an initial or trailing colon. The default path is system-dependent, and is set by the administrator who installs bash. A common value is "/usr/gnu/bin:/usr/local/bin:/usr/ucb:/bin:/usr/bin".
You can see the value of the $PATH variable by executing 'echo "$PATH";' in a terminal window for example.
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oustion about variables(PATH variables)
