added some features

- Added `cron` command to run lists with `cron` time specifed
- Changed `-c` flag to `-f` flag for passing config file
- Modified some config keys
  - cmdArgs -> Args
  - Got rid of `hosts.config`
- better SSH handling
  - respects values in config file

cmd/cron.go

@@ -0,0 +1,24 @@
+package cmd
+
+import (
+	"git.andrewnw.xyz/CyberShell/backy/pkg/backy"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	cronCmd = &cobra.Command{
+		Use:   "cron command ...",
+		Short: "Runs commands defined in config file.",
+		Long:  `Cron executes commands at the time defined in config file.`,
+		Run:   cron,
+	}
+)
+
+func cron(cmd *cobra.Command, args []string) {
+
+	opts := backy.NewOpts(cfgFile, backy.UseCron())
+	opts.InitConfig()
+
+	backy.ReadConfig(opts).Cron()
+}