Added command and list execution (#1), small touchups

- Added exec command to execute individual commands
- Added --lists, -l flag to backup command
  - Run command lists (#1)
- Small touchups and documentation

cmd/exec.go

@@ -0,0 +1,31 @@
+package cmd
+
+import (
+	"git.andrewnw.xyz/CyberShell/backy/pkg/backy"
+	"git.andrewnw.xyz/CyberShell/backy/pkg/logging"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	execCmd = &cobra.Command{
+		Use:   "exec command1 command2",
+		Short: "Runs commands defined in config file.",
+		Long:  `Exec executes commands defined in config file.`,
+		Run:   execute,
+	}
+)
+
+func execute(cmd *cobra.Command, args []string) {
+
+	if len(args) < 1 {
+		logging.ExitWithMSG("Please provide a command to run. Pass --help to see options.", 0, nil)
+	}
+
+	opts := backy.NewOpts(cfgFile, backy.AddCommands(args))
+
+	commands := opts.GetCmdsInConfigFile()
+
+	commands.ExecuteCmds()
+
+}