again for some time.
.It Ic keepenv
The user's environment is maintained.
-The default is to reset the environment, except for the variables
+The default is to retain the variables
.Ev DISPLAY
and
-.Ev TERM .
+.Ev TERM
+from the invoking process, reset
+.Ev HOME ,
+.Ev LOGNAME ,
+.Ev PATH ,
+.Ev SHELL ,
+and
+.Ev USER
+as appropriate for the target user, and discard the rest of the environment.
.It Ic setenv { Oo Ar variable ... Oc Oo Ar variable=value ... Oc Ic }
In addition to the variables mentioned above, keep the space-separated
specified variables.