All commands like LS and VI are invalidated under Linux

Problem Description: Due to my misoperation, the Red Hat Linux environment variables have changed, if the general environment variables have changed can be found on the Internet many solutions, but the hero is on the Linux system to cover the environment variables, such as

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When you perform the Echo $PATH view global variables, the global variables shown are/opt/soft/r-3.3.2

Solution:

1. If this is the error I made above, then in the/root/.bash_profile folder can see the environment variable, the previous addition to remove it, I have removed the file after

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2. If it is not a serious situation, you can modify it on Etc/profile and ETC/BASHRC,/ROOT/.BASHRC files.

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All commands like LS and VI are invalidated under Linux