diff --git a/cmd/containerd/main.go b/cmd/containerd/main.go
index 4f71de6..8adb164 100644
--- a/cmd/containerd/main.go
+++ b/cmd/containerd/main.go
@@ -110,7 +110,7 @@ func main() {
 
 		debugPath := context.GlobalString("debug-socket")
 		if debugPath == "" {
-			return fmt.Errorf("--debug-socket path cannot be empty")
+			return errors.New("--debug-socket path cannot be empty")
 		}
 		d, err := utils.CreateUnixSocket(debugPath)
 		if err != nil {
@@ -125,7 +125,7 @@ func main() {
 
 		path := context.GlobalString("socket")
 		if path == "" {
-			return fmt.Errorf("--socket path cannot be empty")
+			return errors.New("--socket path cannot be empty")
 		}
 		l, err := utils.CreateUnixSocket(path)
 		if err != nil {
diff --git a/cmd/ctr/delete.go b/cmd/ctr/delete.go
index fb4125d..9dfdcba 100644
--- a/cmd/ctr/delete.go
+++ b/cmd/ctr/delete.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	gocontext "context"
-	"fmt"
+	"errors"
 
 	"github.com/docker/containerd/api/execution"
 	"github.com/urfave/cli"
@@ -26,7 +26,7 @@ var deleteCommand = cli.Command{
 
 		id := context.Args().First()
 		if id == "" {
-			return fmt.Errorf("container id must be provided")
+			return errors.New("container id must be provided")
 		}
 
 		pid := uint32(context.Int64("pid"))
diff --git a/cmd/ctr/inspect.go b/cmd/ctr/inspect.go
index b483c68..aa75f19 100644
--- a/cmd/ctr/inspect.go
+++ b/cmd/ctr/inspect.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	gocontext "context"
-	"fmt"
+	"errors"
 
 	"github.com/davecgh/go-spew/spew"
 	"github.com/docker/containerd/api/execution"
@@ -20,7 +20,7 @@ var inspectCommand = cli.Command{
 		}
 		id := context.Args().First()
 		if id == "" {
-			return fmt.Errorf("container id must be provided")
+			return errors.New("container id must be provided")
 		}
 		getResponse, err := executionService.GetContainer(gocontext.Background(),
 			&execution.GetContainerRequest{ID: id})
diff --git a/cmd/ctr/list.go b/cmd/ctr/list.go
index 3802bf2..ae40e8f 100644
--- a/cmd/ctr/list.go
+++ b/cmd/ctr/list.go
@@ -22,7 +22,7 @@ var listCommand = cli.Command{
 		if err != nil {
 			return err
 		}
-		fmt.Printf("ID\tSTATUS\tPROCS\tBUNDLE\n")
+		fmt.Println("ID\tSTATUS\tPROCS\tBUNDLE")
 		for _, c := range listResponse.Containers {
 			listProcResponse, err := executionService.ListProcesses(gocontext.Background(),
 				&execution.ListProcessesRequest{ContainerID: c.ID})
diff --git a/cmd/ctr/shim.go b/cmd/ctr/shim.go
index ac4441b..8395aeb 100644
--- a/cmd/ctr/shim.go
+++ b/cmd/ctr/shim.go
@@ -20,6 +20,7 @@ import (
 	"github.com/crosbymichael/console"
 	"github.com/docker/containerd/api/shim"
 	"github.com/urfave/cli"
+	"github.com/pkg/errors"
 )
 
 var fifoFlags = []cli.Flag{
@@ -75,7 +76,7 @@ var shimCreateCommand = cli.Command{
 	Action: func(context *cli.Context) error {
 		id := context.Args().First()
 		if id == "" {
-			return fmt.Errorf("container id must be provided")
+			return errors.New("container id must be provided")
 		}
 		service, err := getShimService()
 		if err != nil {
diff --git a/cmd/dist/active.go b/cmd/dist/active.go
index 596f1b4..12be2d3 100644
--- a/cmd/dist/active.go
+++ b/cmd/dist/active.go
@@ -54,7 +54,7 @@ var activeCommand = cli.Command{
 		}
 
 		tw := tabwriter.NewWriter(os.Stdout, 1, 8, 1, '\t', 0)
-		fmt.Fprintf(tw, "REF\tSIZE\tAGE\n")
+		fmt.Fprintln(tw, "REF\tSIZE\tAGE")
 		for _, active := range active {
 			fmt.Fprintf(tw, "%s\t%s\t%s\n",
 				active.Ref,
diff --git a/cmd/dist/fetch.go b/cmd/dist/fetch.go
index bfab3cd..6af629f 100644
--- a/cmd/dist/fetch.go
+++ b/cmd/dist/fetch.go
@@ -52,11 +52,11 @@ var fetchCommand = cli.Command{
 		}
 
 		if locator == "" {
-			return fmt.Errorf("containerd: remote required")
+			return errors.New("containerd: remote required")
 		}
 
 		if len(args) < 1 {
-			return fmt.Errorf("containerd: object required")
+			return errors.New("containerd: object required")
 		}
 
 		object := args[0]
diff --git a/testutil/helpers.go b/testutil/helpers.go
index 9e18afb..af46b4b 100644
--- a/testutil/helpers.go
+++ b/testutil/helpers.go
@@ -60,7 +60,7 @@ func DumpDir(t *testing.T, root string) {
 		} else if fi.Mode().IsRegular() {
 			p, err := ioutil.ReadFile(path)
 			if err != nil {
-				t.Log("error reading file: %v", err)
+				t.Logf("error reading file: %v", err)
 				return nil
 			}