How to UNDO unwanted changes on my raspberry pi 4. Bash_profile not found

Question

Updated Question. I was trying to add this directory "/usr/local/opt/python-3.9.0/bin" to PATH on raspberry pi 4 and so I edited the bash file by adding the line: PATH = "/usr/local/opt/python-3.9.0/bin $PATH". I now realized this was wrong. When path is echoed now by typing , I can only see that python 3.9.0 path. I am unable to edit the bash file again as all the commands to open it are not recognized. Is there a way to change this, that is to change back to the default path? How can I removed the PATH I added wrongly? Almost all the basic commands such as sudo apt update, sudo apt full-upgrade etc appears not to be working at the terminal again because of this. Thank you in advance.

Answer 1

As already mentioned by others you have to use a colon instead of a space to concatenate paths:

PATH=$PATH:/usr/local/opt/python-3.9.0/bin
or
PATH=/usr/local/opt/python-3.9.0/bin:$PATH

The problem now is that you have destroyed the default search path so programs and editors are not found or they cannot find their environment. To temporary fix it you can set the PATH by hand. Just export the default path:

rpi ~$ export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games

Now you should be able to use editors and other programs again and you can fix your problem.