Differences between linux commands su and su-

The biggest essential difference between the su command and the su-command is that su only switches the root identity, but the Shell environment is still the Shell of ordinary users; the su-connected user and the Shell environment are switched to the root identity. The PATH environment variable error does not occur only when the Shell environment is switched. After su is switched to the root user, pwd finds that the working directory is still the working directory of normal users. After su-command is switched, the working directory is changed to the root working directory. Run the echo $ PATH command to check whether the environment variables after su and su are different. Similarly, to switch from the current user to another user, use the su-command.