I tried to set an environment variable for the Sublist3r tool and messed up. Now whenever I switch to the root user (with sudo su) the only command I am able to use is exit (attaching the images).
I tried to edit /root/.bashrc but it seems to be fine on non-root user account. I also checked the PATH on root account which it is showing as 'sublister-1'. How can I edit /root/.bashrc?
As the normal user:
sudo /bin/nano /root/.bashrc And please don't sudo su, you can use sudo -i and sudo -s to get elevated shells (see the Q/A Is there ever a good reason to run sudo su?).
sudo su is perfectly okay depending on use cases, as of "missing" commands, utilities is still there, you just need to use full paths to access them.
/usr/bin/nano /usr/bin/vim and so on, fix your $PATH and it should be back to normal