Note that the default behavior for the environment is the following:

               The $HOME, $SHELL, $USER, $LOGNAME, $PATH, and $IFS environment variables are reset.

               If --login is not used, the environment is copied, except for the variables above.

               If --login is used, the $TERM, $COLORTERM, $DISPLAY, and $XAUTHORITY environment variables are copied if they were set.

               Other environments might be set by PAM modules.