Find items that exist in multiple places in the os PATH

main.go

package main

import (
	"fmt"
	"os"
	"sort"
	"strings"
)

func main() {
	dirs := strings.Split(os.Getenv("PATH"), ":")
	if len(dirs) == 1 && dirs[0] == "" {
		fmt.Println("No paths found! is 'PATH' var populated?")
		os.Exit(1)
	}

	fmt.Printf("Searching paths: %+v\n\n", dirs)

	maxLen := 0
	bins := []string{}
	paths := map[string][]string{}

	for _, p := range dirs {
		if len(p) == 0 {
			continue
		}

		files, err := os.ReadDir(p)
		if err != nil {
			fmt.Println(err)
			continue
		}

		for _, file := range files {
			name := file.Name()
			if file.IsDir() {
				name = name + " (dir)"
			}

			if len(name) > maxLen {
				maxLen = len(name)
			}

			if _, ok := paths[name]; !ok {
				bins = append(bins, name)
			}

			paths[name] = append(paths[name], p)
		}
	}

	fmt.Println()
	sort.Strings(bins)

	for _, bin := range bins {
		if len(paths[bin]) > 1 {
			fmt.Printf("%*s found in multiple locations: %s\n", maxLen, bin, paths[bin])
		}
	}
}