if you want to change a bash environment variable you need to set it in each and every bash multistatement
$ env TERM=lpr env|grep TERM ; env TERM=lpr env|grep TERM TERM=lpr COLORTERM=xfce4-terminal TERM=lpr COLORTERM=xfce4-terminal $ env TERM=lpr env|grep TERM && env TERM=lpr env|grep TERM TERM=lpr COLORTERM=xfce4-terminal TERM=lpr COLORTERM=xfce4-terminal