cowsayeternal: Use a temporary file to circumvent argument size restrictions

cowsayeternal

@@ -1,10 +1,16 @@
 #!/bin/bash
-cowsaid="$(cowsay "E T E R N A L")"
+cowsaidfile="$(mktemp)"
+cowsay "E T E R N A L" > "$cowsaidfile"
 trap_exit() {
-	printf "%s" "$cowsaid"
+	cat "$cowsaidfile"
+	rm "$cowsaidfile"
 }
 trap trap_exit EXIT
 while true; do
-	cowsaid="$(cowsay -n <<< "$cowsaid")"
-	printf "%s characters of cowsay; hit Ctrl+C to dump them\\n" "$(wc -c <<< "$cowsaid")"
+	# Shut up shellcheck; that's the whole point. cowsay does a full read
+	# before it writes back to the file anyway.
+	# shellcheck disable=2094
+	cowsay -n < "$cowsaidfile" 1<> "$cowsaidfile"
+	printf "%s bytes of cowsay; hit Ctrl+C to dump them\\n" \
+		"$(stat --printf="%s" "$cowsaidfile")"
 done