The command line tools now say so if the source directory of an option doesn't exist.

h2/src/main/org/h2/command/dml/BackupCommand.java

@@ -67,6 +67,7 @@ public class BackupCommand extends Prepared {
             synchronized (db.getLobSyncObject()) {
                 String prefix = db.getDatabasePath();
                 String dir = IOUtils.getParent(prefix);
+                dir = FileLister.getDir(dir);
                 ArrayList<String> fileList = FileLister.getDatabaseFiles(dir, name, true);
                 for (String n : fileList) {
                     if (n.endsWith(Constants.SUFFIX_LOB_FILE)) {

h2/src/main/org/h2/store/FileLister.java

@@ -62,20 +62,29 @@ public class FileLister {
     }
 
     /**
-     * Get the list of database files.
+     * Normalize the directory name.
      *
      * @param dir the directory (null for the current directory)
+     * @return the normalized directory name
+     */
+    public static String getDir(String dir) {
+        if (dir == null || dir.equals("")) {
+            return ".";
+        }
+        return IOUtils.normalize(dir);
+    }
+
+    /**
+     * Get the list of database files.
+     *
+     * @param dir the directory (must be normalized)
      * @param db the database name (null for all databases)
-     * @param all  if true, files such as the lock, trace, and lob
+     * @param all if true, files such as the lock, trace, and lob
      *            files are included. If false, only data, index, log,
      *            and lob files are returned
      * @return the list of files
      */
     public static ArrayList<String> getDatabaseFiles(String dir, String db, boolean all) {
-        if (dir == null || dir.equals("")) {
-            dir = ".";
-        }
-        dir = IOUtils.normalize(dir);
         ArrayList<String> files = New.arrayList();
         String start = db == null ? null : IOUtils.normalize(dir + "/" + db);
         String[] list = IOUtils.listFiles(dir);

h2/src/main/org/h2/tools/Backup.java

@@ -105,15 +105,15 @@ public class Backup extends Tool {
 
     private void process(String zipFileName, String directory, String db, boolean quiet) throws SQLException {
         ArrayList<String> list = FileLister.getDatabaseFiles(directory, db, true);
-        if (!quiet) {
-            FileLister.tryUnlockDatabase(list, "backup");
-        }
         if (list.size() == 0) {
             if (!quiet) {
                 printNoDatabaseFilesFound(directory, db);
             }
             return;
         }
+        if (!quiet) {
+            FileLister.tryUnlockDatabase(list, "backup");
+        }
         zipFileName = IOUtils.normalize(zipFileName);
         if (IOUtils.exists(zipFileName)) {
             IOUtils.delete(zipFileName);

h2/src/main/org/h2/tools/ChangeFileEncryption.java

@@ -131,6 +131,7 @@ public class ChangeFileEncryption extends Tool {
     }
 
     private void process(String dir, String db, String cipher, char[] decryptPassword, char[] encryptPassword, boolean quiet) throws SQLException {
+        dir = FileLister.getDir(dir);
         ChangeFileEncryption change = new ChangeFileEncryption();
         if (encryptPassword != null) {
             for (char c : encryptPassword) {

h2/src/main/org/h2/tools/DeleteDbFiles.java

@@ -85,11 +85,11 @@ public class DeleteDbFiles extends Tool {
      * @throws SQLException
      */
     private void process(String dir, String db, boolean quiet) throws SQLException {
-        DeleteDbFiles delete = new DeleteDbFiles();
         ArrayList<String> files = FileLister.getDatabaseFiles(dir, db, true);
         if (files.size() == 0 && !quiet) {
             printNoDatabaseFilesFound(dir, db);
         }
+        DeleteDbFiles delete = new DeleteDbFiles();
         for (String fileName : files) {
             delete.process(fileName, quiet);
             if (!quiet) {

h2/src/main/org/h2/util/Tool.java

@@ -11,6 +11,7 @@ import java.io.IOException;
 import java.io.PrintStream;
 import java.sql.SQLException;
 import java.util.Properties;
+import org.h2.store.FileLister;
 
 /**
  * Command line tools implement the tool interface so that they can be used in
@@ -59,12 +60,17 @@ public abstract class Tool {
      * @param db the database name or null
      */
     protected void printNoDatabaseFilesFound(String dir, String db) {
-        StringBuilder buff = new StringBuilder("No database files have been found");
-        if (dir != null) {
+        StringBuilder buff;
+        dir = FileLister.getDir(dir);
+        if (!IOUtils.isDirectory(dir)) {
+            buff = new StringBuilder("Directory not found: ");
+            buff.append(dir);
+        } else {
+            buff = new StringBuilder("No database files have been found");
             buff.append(" in directory ").append(dir);
-        }
-        if (db != null) {
-            buff.append(" for the database ").append(db);
+            if (db != null) {
+                buff.append(" for the database ").append(db);
+            }
         }
         out.println(buff.toString());
     }