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As an example, the bash shell program incorporates the contents of file .bash_profile by inclusion.Place the following 2 lines in .bash_profile: variable.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange at the end (to be searched after all other directories, in case there is a program by the same name in multiple directories) or at the beginning (to be searched before all other directories). gets built by many different components, you might end up with duplicate entries.See How to add home directory path to be discovered by Unix which command?and Remove duplicate $PATH entries with awk command to avoid adding duplicates or remove them.
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And because any programs you run from a bash prompt are called by bash, the new path is in force for anything you run from the bash prompt.
The bottom line is that to add a new directory to the path, you must append or prepend the directory to the $PATH environment variable within a script included in the shell, and you must export the I can't speak for other distributions, but Ubuntu has a file, /etc/environment, that is the default search path for all users.