diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..0e32bb7
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+golang 1.18.1
diff --git a/README.md b/README.md
index 87c4d37..4c8c3f5 100644
--- a/README.md
+++ b/README.md
@@ -17,30 +17,41 @@ A kitchen sink of Go tools that I've found useful. Uses only the standard librar
 go get github.com/jritsema/gotoolbox
 ```
 
-### utils
+### utilities
 
 ```go
 package main
 
-import utils "github.com/jritsema/gotoolbox"
+import "github.com/jritsema/gotoolbox"
 
 func main() {
 
 	s := []string{"a", "b", "c"}
-	if utils.SliceContains(&s, "b") {
+	if gotoolbox.SliceContainsLike(&s, "b") {
 		fmt.Println("b exists")
 	}
 
-	err := utils.Retry(3, 1, func() error {
+	err := gotoolbox.Retry(3, 1, func() error {
 		return callBrittleAPI()
 	})
 	if err != nil {
 		fmt.Println("callBrittleAPI failed after 3 retries: %w", err)
 	}
 
-	config, err := utils.ReadJSONFile("config.json")
+	f := "config.json"
+	if !gotoolbox.IsDirectory(f) && gotoolbox.FileExists(f) {
+		config, err := gotoolbox.ReadJSONFile(f)
+		if err != nil {
+			fmt.Println("error reading json file: %w", err)
+		}
+	}
+
+	value := gotoolbox.GetEnvWithDefault("MY_ENVVAR", "true")
+
+	command := exec.Command("docker", "build", "-t", "foo", ".")
+	err = gotoolbox.ExecCmd(command, true)
 	if err != nil {
-		fmt.Println("error reading json file: %w", err)
+		fmt.Println("error executing command: %w", err)
 	}
 }
 ```
diff --git a/cli.go b/cli.go
index ec2b8da..6c1b608 100644
--- a/cli.go
+++ b/cli.go
@@ -17,12 +17,17 @@ func GetEnvWithDefault(key, defaultValue string) string {
 }
 
 //ExecCmd executes a command and waits
-func ExecCmd(cmd *exec.Cmd) error {
+func ExecCmd(cmd *exec.Cmd, output bool) error {
 
 	var outbuf, errbuf bytes.Buffer
 	cmd.Stdout = &outbuf
 	cmd.Stderr = &errbuf
 
+	if output {
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+	}
+
 	err := cmd.Start()
 	if err != nil {
 		return err
diff --git a/go.mod b/go.mod
index 93497c3..fed4133 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,3 @@
 module github.com/jritsema/gotoolbox
 
-go 1.15
-
+go 1.18