fix

main.go

@@ -99,7 +99,7 @@ func main() {
 
 		dir, _ := filepath.Abs(*directory)
 
-		cmd := exec.Command("./tncmd.sh", filepath.Join(dir, e.Name()), "./thumbnails")
+		cmd := exec.Command("./tncmd.sh", filepath.Join(dir, e.Name()))
 
 		fmt.Println(cmd)
 

tncmd.sh

@@ -1,2 +1,2 @@
 #!/bin/bash
-convert -thumbnail "140x200" -background white -alpha remove -crop 178x178+0+0 "$1"[0] "$2/${1%.pdf}.png"
+convert -thumbnail "140x200" -background white -alpha remove -crop 178x178+0+0 "$1"[0] "${1%.pdf}.png"