9-filesystem-basic/which

Author: kyu08

9-filesystem-basic/which/go.mod

@@ -0,0 +1,3 @@
+module github.com/kyu08/go-system-programming/which
+
+go 1.22.3

9-filesystem-basic/which/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	if len(os.Args) != 2 {
+		fmt.Printf("%s [exec path]\n", os.Args[0])
+		os.Exit(1)
+	}
+
+	for _, path := range filepath.SplitList(os.Getenv("PATH")) {
+		execpath := filepath.Join(path, os.Args[1])
+		_, err := os.Stat(execpath)
+		if !os.IsNotExist(err) {
+			fmt.Println(execpath)
+			return
+		}
+	}
+	os.Exit(1)
+}