What are PATH and other environment variables, and how can I set or use them?
Problem
Questions about setting environment variables the are very common here, and in most cases the answers are very similar to each other. In the future it would be nice to have a good Q/A for this. So the question is: What are environment variables, like the executable , and how can I change and use them on major operating systems? A good answer would include a simple explanation of what environment variables and especially mean to the OS, as well as simple guidelines on how to set and read them accordingly.
Error Output
PATH
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1 Fix
Fix for: What are PATH and other environment variables, and how can I set or use them?
What are Environment Variables? Environment variables hold values related to the current environment, like the Operating System or user sessions. Path One of the most well-known is called on Windows, Linux and Mac OS X. It specifies the directories in which executable programs* are located on the machine that can be started without knowing and typing the whole path to the file on the command line. (Or in Windows, the Run dialog in the Start Menu or +R). On Linux and Mac OS X, it usually holds a…
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