How to permanently set $PATH on Linux?

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http://stackoverflow.com – I'm trying to add a directory to my path so it will always be in my Linux path. I've tried: export PATH=$PATH:/path/to/dir This works, however each time I exit the terminal and start a new terminal instance, this path is lost, and I need to run the export command again. How can I do it so this will be set permanently? (HowTos)