1 files changed, 1 insertions, 1 deletions
diff --git a/install.sh b/install.sh
index ced9e89..08a7fde 100755
--- a/install.sh
+++ b/install.sh
@@ -21,7 +21,7 @@ countdown_seconds(){
     default_countdown=5
     if [ ! -z "$1" ] && [ -n "$1" ]
     then
-        if [ "$1" ~= '^[0-9]*$' ]
+        if [ "$(echo -n $1 | sed -e 's/^[0-9]*$//g')" == "" ]
         then
             countdown=$1
         else