cmd examplte

cmd/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+
+	"github.com/davecgh/go-spew/spew"
+)
+
+func main() {
+	cmd := "ls"
+	args := []string{"-ll"}
+	out, err := exec.Command(cmd, args...).Output()
+	spew.Dump(string(out), err)
+	if err := exec.Command(cmd, args...).Run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	fmt.Println("Successfully halved image in size")
+}

ioreader/main.go

@@ -0,0 +1,12 @@
+package main
+
+// https://medium.com/@matryer/golang-advent-calendar-day-seventeen-io-reader-in-depth-6f744bb4320b
+
+// Take io.Reader when you can
+// If you’re designing a package or utility (even if it’s an internal thing that nobody will ever see)
+// rather than taking in strings or []byte slices, consider taking in an io.Reader if you can for data sources.
+// Because suddenly, your code will work with every type that implements io.Reader.
+
+func main() {
+
+}