-## 3 -- original stderr (verbose), or logfile (quiet); captures command
-## output
-## 4 -- null (verbose), or logfile (quiet); primary diagnostic output
-## 5 -- orginal stderr; secondary diagnostic output (with colours)
-
-exec 3>&2 4>/dev/null 5>&2
+## log -- logfile and original stderr (verbose), or logfile only (quiet);
+## captures command output
+## diag -- logfile; primary diagnostic output
+## term -- orginal stderr; secondary diagnostic output (with colours)