Fix R update script

script-system-update-r

@@ -13,15 +13,20 @@ is_root
 
 if [[ $# -eq 2 ]]; then
     re='^[0-9].[0-9].[0-9]$'
-    [[ $1 =~ $re ]] || echo "Bad R version number" && exit 1
+    if [[ ! $1 =~ $re ]]; then
+        echo "Bad R version number"
+        exit 1
+    fi
     re='^[0-9][0-9][0-9][0-9].[0-9][0-9].[0-9]-[0-9]+$'
-    [[ $2 =~ $re ]] || echo "Bad RStudio version number" && exit 1
+    if [[ ! $2 =~ $re ]]; then
+        echo "Bad RStudio version number"
+        exit 1
+    fi
 else
     echo "You must provide exactly two arguments!"
     echo "\$1: R version, ex. '4.1.2'"
     echo "\$2: RStudio version, ex. '2021.09.1-372'"
     exit 1
-
 fi
 
 ask_ok "Update R to version $1 and RStudio to version $2?" || exit $?