Update virtmon

sdata/subcmd-virtmon/options.sh

@@ -8,12 +8,13 @@ Create virtual monitor for testing multi-monitors.
 
 Options:
   -h, --help       Show this help message
+  -k, --keep       Do not remove virtual monitors
 "
 }
 # `man getopt` to see more
 para=$(getopt \
-  -o h \
-  -l help \
+  -o hk \
+  -l help,keep \
   -n "$0" -- "$@")
 [ $? != 0 ] && echo "$0: Error when getopt, please recheck parameters." && exit 1
 #####################################################################################
@@ -26,6 +27,15 @@ while true ; do
   esac
 done
 
+eval set -- "$para"
+while true ; do
+  case "$1" in
+    -k|--keep) KEEP_VIRTUAL_MONITORS=true;shift;;
+    --) shift;break ;;
+    *) sleep 0 ;;
+  esac
+done
+
 #if [[ -f "$1" ]]; then
 #  echo "Using list file \"$1\".";LIST_FILE_PATH="$1";shift 1
 #else