log the time on the same line of the message

patch-control.sh

@@ -73,10 +73,9 @@ function dm_driver() {
 }
 
 function log() {
-  [ ! -d ~/.km3_private ] && mkdir -p ~/.km3_private
-  local logfile="~/.km3_private/pc.log"
-  date      >>${logfile}
-  echo ${*} >>${logfile}
+  [ ! -d ${HOME}/.km3_private ] && mkdir -p ${HOME}/.km3_private
+  local logfile="${HOME}/.km3_private/pc.log"
+  echo "$(date): ${*}" >>${logfile}
 }
 
 function nowUTC() {