diff --git a/lib/cmdtest/testcase.rb b/lib/cmdtest/testcase.rb
index bf36b43..db8ecea 100644
--- a/lib/cmdtest/testcase.rb
+++ b/lib/cmdtest/testcase.rb
@@ -497,7 +497,29 @@ module Cmdtest
 
     #------------------------------
 
+    def _args_to_quoted_string(args)
+      quoted_args = []
+      for arg in args
+        if arg =~ /[;&()><\\| $"]/
+          quoted_arg = arg.dup
+          quoted_arg.gsub!(/\\/, "\\\\")
+          quoted_arg.gsub!(/"/, "\\\"")
+          quoted_arg.gsub!(/\$/, "\\$")
+         quoted_arg.gsub!(/`/, "\\\\`")
+          quoted_args << '"' + quoted_arg + '"'
+        else
+          quoted_args << arg
+        end
+      end
+      quoted_args.join(" ")
+    end
+
+    #------------------------------
+
     def cmd(cmdline)
+      if Array === cmdline
+        cmdline = _args_to_quoted_string(cmdline)
+      end
       Util.wait_for_new_second
       _update_hardlinks
       @_cmdline = cmdline
diff --git a/t/01-cmd.rb b/t/01-cmd.rb
new file mode 100644
index 0000000..90833d0
--- /dev/null
+++ b/t/01-cmd.rb
@@ -0,0 +1,109 @@
+#======================================================================
+
+#-----------------------------------
+# Using Array argument to cmd
+
+cmd ["lines.rb", "this is an argument", "and another"] do
+    stdout_equal [
+        "this is an argument",
+        "and another",
+    ]
+end
+
+# stdout begin
+# ### lines.rb "this is an argument" "and another"
+# stdout end
+
+#-----------------------------------
+# only some arguments need quoting
+
+cmd ["lines.rb", "arg1", "a r g 2", "<arg3>"] do
+    stdout_equal [
+        "arg1",
+        "a r g 2",
+        "<arg3>",
+    ]
+end
+
+# stdout begin
+# ### lines.rb arg1 "a r g 2" "<arg3>"
+# stdout end
+
+#-----------------------------------
+# array with no arguments
+
+cmd ["true.rb"] do
+end
+
+# stdout begin
+# ### true.rb
+# stdout end
+
+#-----------------------------------
+# array with no arguments (II)
+
+cmd ["false.rb"] do
+    exit_nonzero
+end
+
+# stdout begin
+# ### false.rb
+# stdout end
+
+#-----------------------------------
+# array with " and \ in arguments
+
+cmd ["lines.rb", "emb\"edded1", "emb\\edded2", "emb\\edd\"ed3"] do
+    stdout_equal [
+        "emb\"edded1",
+        "emb\\edded2",
+        "emb\\edd\"ed3",
+    ]
+end
+
+# stdout begin
+# ### lines.rb "emb\"edded1" "emb\edded2" "emb\edd\"ed3"
+# stdout end
+
+#-----------------------------------
+# array with $ arguments
+
+cmd ["lines.rb", "emb$edded1", "emb$$edded2"] do
+    stdout_equal [
+        "emb$edded1",
+        "emb$$edded2",
+    ]
+end
+
+# stdout begin
+# ### lines.rb "emb\$edded1" "emb\$\$edded2"
+# stdout end
+
+#-----------------------------------
+# "all" characters (but not ` for now)
+
+all = " !\"\#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_abcdefghijklmnopqrstuvwxyz{|}~"
+cmd ["lines.rb", all] do
+    stdout_equal [
+        " !\"\#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_abcdefghijklmnopqrstuvwxyz{|}~"
+    ]
+end
+
+# stdout begin
+# ### lines.rb " !\"#\$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_abcdefghijklmnopqrstuvwxyz{|}~"
+# stdout end
+
+#-----------------------------------
+# "`" character
+
+all = " ` "
+cmd ["lines.rb", all] do
+    stdout_equal [
+        " ` ",
+    ]
+end
+
+# stdout begin
+# ### lines.rb " \` "
+# stdout end
+