Basic idea for nohup started but needs more research.

nohup/.gitignore

@@ -0,0 +1,2 @@
+nohup
+nohup.exe

nohup/Makefile

@@ -0,0 +1,3 @@
+
+build:
+	go build .

nohup/go.mod

@@ -0,0 +1,7 @@
+module lcthw.dev/go/go-coreutils/nohup
+
+go 1.25.3
+
+require github.com/mattn/go-isatty v0.0.20
+
+require golang.org/x/sys v0.6.0 // indirect

nohup/go.sum

@@ -0,0 +1,4 @@
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

nohup/main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+  "fmt"
+  "os"
+  "os/exec"
+  "github.com/mattn/go-isatty"
+  "flag"
+  "log"
+  "io"
+)
+
+func main() {
+  flag.Parse()
+  prog := flag.Args()[0]
+
+  // ignore SIGHUP
+
+  if isatty.IsTerminal(os.Stdout.Fd()) {
+    fmt.Println("Is Terminal")
+  } else if isatty.IsCygwinTerminal(os.Stdout.Fd()) {
+    fmt.Println("Is cygwin/msys2 terminal")
+  } else {
+    cmd := exec.Command(prog)
+    if cmd.Err != nil { log.Fatal(cmd.Err) }
+
+    in, err := cmd.StdinPipe()
+    if err != nil { log.Fatal(err) }
+    in.Close()
+
+    stdout, err := cmd.StdoutPipe()
+    if err != nil { log.Fatal(err) }
+
+    stderr, err := cmd.StderrPipe()
+    if err != nil { log.Fatal(err) }
+
+    output := io.MultiReader(stdout, stderr)
+
+    err = cmd.Start()
+    if err != nil { log.Fatal(err) }
+
+    _, err = io.Copy(os.Stdout, output)
+    if err != nil { log.Fatal(err) }
+  }
+}