Basic curl working.

curl/.gitignore

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+curl
+curl.exe

curl/Makefile

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+
+
+build:
+	go build .

curl/go.mod

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+module lcthw.dev/go/go-coreutils/curl
+
+go 1.25.3

curl/main.go

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+package main
+
+import (
+  "fmt"
+  "net/http"
+  "flag"
+  "log"
+  "os"
+  "io"
+  "path/filepath"
+)
+
+func main() {
+  var save bool
+  var headers bool
+
+  flag.BoolVar(&save, "O", false, "output file to local disk")
+  flag.BoolVar(&headers, "I", false, "inspect headers")
+  flag.Parse()
+
+  if flag.NArg() == 0 { log.Fatal("USAGE: curl [-O] [-I] URL") }
+
+  target_url := flag.Args()[0]
+
+  resp, err := http.Get(target_url)
+  if err != nil { log.Fatal(err) }
+
+  if headers {
+    for key, values := range resp.Header {
+      for _, val := range values {
+        fmt.Printf("%s: %s\n", key, val)
+      }
+    }
+  } else if save {
+    output := filepath.Base(resp.Request.URL.Path)
+
+    out, err := os.Create(output)
+    if err != nil { log.Fatal(err) }
+
+    io.Copy(out, resp.Body)
+  } else { 
+    io.Copy(os.Stdout, resp.Body)
+  }
+}