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[[Image:environment.png|thumb|right|500px|Examples of using '''Environment''' and '''User Defined''' variables.]]Shell '''environment variables''' shape the working environment whenever you are logged in Common shell. Some of these variables are displayed via Linux commands in the diagram displayed on the right-side.<br>(you <br>You can issue the pipeline command '''set | more''' to view all variables) .<br><br>Placing a dollar sign ('''$''') prior to the variable name will cause the variable to expand to the value contained in the variable.