diff --git a/README.md b/README.md
index c818b4e..8d537c1 100644
--- a/README.md
+++ b/README.md
@@ -313,7 +313,7 @@ Content:
 #!/usr/bin/env sh
 
 if [ "$3" = "exec" ]; then
-	command ls | format -i "$1" -o "mv \"{0}\" \"$2\"" | xargs -0 -P 4 sh -c
+	command ls | format -0 -i "$1" -o "mv \"{0}\" \"$2\"" | xargs -0 -P 4 -I {} sh -c "{}"
 else
 	command ls | format -i "$1" -o "mv \"{0}\" \"$2\""
 	echo
diff --git a/main.go b/main.go
index 9a6dc01..d76d9c5 100644
--- a/main.go
+++ b/main.go
@@ -140,7 +140,7 @@ func ReadLine(r *bufio.Reader) (string, error) {
 }
 
 func replaceVars(format string, vars ...string) string {
-	replacements := replacePattern.FindAllStringSubmatch(format, -1)
+	replacements := replacePattern.FindAllStringSubmatch(format, -1) // TODO arguments do not change in outer loop (can be moved to main method)
 
 	for _, replacement := range replacements {
 		rplStr := replacement[0]