-P not available in old versions of env

main.go

@@ -121,8 +121,7 @@ func (p *program) unpathEntry(dir string, entries []fs.DirEntry, unpathN int) (s
 }
 
 func (p *program) run(cmd []string, path string) int {
-	arg := append([]string{"-P", path}, cmd...)
-	subcmd := exec.Command("env", arg...)
+	subcmd := exec.Command(cmd[0], cmd[1:]...)
 	subcmd.Env = append(subcmd.Environ(), fmt.Sprintf("PATH=%s", path))
 	subcmd.Stdout = p.stdout
 	subcmd.Stderr = p.stderr

main_test.go

@@ -10,26 +10,6 @@ import (
 	"testing"
 )
 
-func TestUnpathsNonExistingCommand(t *testing.T) {
-	var stdout, stderr bytes.Buffer
-	status := newProgram([]string{"unpath", "not-cat", "cat", "main_test.go"}, &stdout, &stderr).main()
-	if status != 0 {
-		t.Fatal(stderr)
-	}
-}
-
-func TestUnpathsCommand(t *testing.T) {
-	var stdout, stderr bytes.Buffer
-	status := newProgram([]string{"unpath", "cat", "cat", "main_test.go"}, &stdout, &stderr).main()
-	if status == 0 {
-		t.Errorf("got: %d; want: %d", status, 0)
-	}
-	message := "env: cat: No such file or directory"
-	if !strings.Contains(stderr.String(), message) {
-		t.Errorf("got: %s; want: %s", stderr.String(), message)
-	}
-}
-
 func TestUnpathsNonExistingCommandThroughScript(t *testing.T) {
 	script := createScript("#!/usr/bin/env bash\ncat $1", t.Fatal)
 	var stdout, stderr bytes.Buffer