made run return the standard out output

lib/sftp/shell.rb

@@ -2,10 +2,11 @@ module SFTP
   module Shell
     def self.run(array_of_commands)
       command_str = [array_of_commands].join(" ")
-      `bash  -c \"#{command_str}\"`
-      return if $CHILD_STATUS.success?
-
-      raise Error, "Error occurred during SFTP process: #{$CHILD_STATUS.exitstatus}"
+      output = `bash  -c \"#{command_str}\"`
+      unless $CHILD_STATUS.success?
+        raise Error, "Error occurred during SFTP process: #{$CHILD_STATUS.exitstatus}"
+      end
+      output
     end
   end
 end

spec/sftp_spec.rb

@@ -105,5 +105,9 @@
     it "throws Error when run fails" do
       expect { @shell.run ["gobbledegook"] }.to raise_error(SFTP::Error)
     end
+
+    it "returns the output from the command" do
+      expect(@shell.run(["ls"]).class.to_s).to eq("String")
+    end
   end
 end