How to point a command to use new version of application
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I would not recommend to do that. Python 2 and Python 3 are not compatible. Many tools that rely on Python are still written for Python 2. If you point all applications that are using Python to Python 3 you will most likely break the system.
ls -l /usr/bin/python* will give you some information. /usr/bin/python is probably a symbolic link to pythonX.Y, you can change the link. As it was stated python 2 and python 3 are not compatible, so be careful!
Thanks for reminding me about the compatibility issue between version 2 and 3.
You are right ... I should be careful since there could be other applications/services using "python2.x", that calls "python2.x" using the command just "python".
But I can confirmed that "python" is not a symbolic link to "python2.x". Then I do a "file python" is says its a "ELF 64-bit LSB executable"