diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index 55c7abe3d0..80ddd598e0 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -9,6 +9,7 @@
 #include <common.h>
 #include <command.h>
 #include <efi_dt_fixup.h>
+#include <efi_load_initrd.h>
 #include <efi_loader.h>
 #include <efi_rng.h>
 #include <exports.h>
@@ -19,6 +20,7 @@
 #include <part.h>
 #include <search.h>
 #include <linux/ctype.h>
+#include <linux/err.h>
 
 #define BS systab.boottime
 #define RT systab.runtime
@@ -798,6 +800,54 @@ static int do_efi_show_tables(struct cmd_tbl *cmdtp, int flag,
 	return CMD_RET_SUCCESS;
 }
 
+/**
+ * create_initrd_dp() - Create a special device for our Boot### option
+ *
+ * @dev:	Device
+ * @part:	Disk partition
+ * @file:	Filename
+ * Return:	Pointer to the device path or ERR_PTR
+ *
+ */
+static
+struct efi_device_path *create_initrd_dp(const char *dev, const char *part,
+					 const char *file)
+
+{
+	struct efi_device_path *tmp_dp = NULL, *tmp_fp = NULL;
+	struct efi_device_path *initrd_dp = NULL;
+	efi_status_t ret;
+	const struct efi_initrd_dp id_dp = {
+		.vendor = {
+			{
+			DEVICE_PATH_TYPE_MEDIA_DEVICE,
+			DEVICE_PATH_SUB_TYPE_VENDOR_PATH,
+			sizeof(id_dp.vendor),
+			},
+			EFI_INITRD_MEDIA_GUID,
+		},
+		.end = {
+			DEVICE_PATH_TYPE_END,
+			DEVICE_PATH_SUB_TYPE_END,
+			sizeof(id_dp.end),
+		}
+	};
+
+	ret = efi_dp_from_name(dev, part, file, &tmp_dp, &tmp_fp);
+	if (ret != EFI_SUCCESS) {
+		printf("Cannot create device path for \"%s %s\"\n", part, file);
+		goto out;
+	}
+
+	initrd_dp = efi_dp_append((const struct efi_device_path *)&id_dp,
+				  tmp_fp);
+
+out:
+	efi_free_pool(tmp_dp);
+	efi_free_pool(tmp_fp);
+	return initrd_dp;
+}
+
 /**
  * do_efi_boot_add() - set UEFI load option
  *
@@ -810,7 +860,9 @@ static int do_efi_show_tables(struct cmd_tbl *cmdtp, int flag,
  *
  * Implement efidebug "boot add" sub-command. Create or change UEFI load option.
  *
- *     efidebug boot add <id> <label> <interface> <devnum>[:<part>] <file> <options>
+ * efidebug boot add -b <id> <label> <interface> <devnum>[:<part>] <file>
+ *                   -i <file> <interface2> <devnum2>[:<part>] <initrd>
+ *                   -s '<options>'
  */
 static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag,
 			   int argc, char *const argv[])
@@ -823,55 +875,105 @@ static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag,
 	size_t label_len, label_len16;
 	u16 *label;
 	struct efi_device_path *device_path = NULL, *file_path = NULL;
+	struct efi_device_path *final_fp = NULL;
+	struct efi_device_path *initrd_dp = NULL;
 	struct efi_load_option lo;
 	void *data = NULL;
 	efi_uintn_t size;
+	efi_uintn_t fp_size = 0;
 	efi_status_t ret;
 	int r = CMD_RET_SUCCESS;
 
-	if (argc < 6 || argc > 7)
-		return CMD_RET_USAGE;
-
-	id = (int)simple_strtoul(argv[1], &endp, 16);
-	if (*endp != '\0' || id > 0xffff)
-		return CMD_RET_USAGE;
-
-	sprintf(var_name, "Boot%04X", id);
-	p = var_name16;
-	utf8_utf16_strncpy(&p, var_name, 9);
-
 	guid = efi_global_variable_guid;
 
 	/* attributes */
 	lo.attributes = LOAD_OPTION_ACTIVE; /* always ACTIVE */
+	lo.optional_data = NULL;
+	lo.label = NULL;
 
-	/* label */
-	label_len = strlen(argv[2]);
-	label_len16 = utf8_utf16_strnlen(argv[2], label_len);
-	label = malloc((label_len16 + 1) * sizeof(u16));
-	if (!label)
-		return CMD_RET_FAILURE;
-	lo.label = label; /* label will be changed below */
-	utf8_utf16_strncpy(&label, argv[2], label_len);
+	argc--;
+	argv++; /* 'add' */
+	for (; argc > 0; argc--, argv++) {
+		if (!strcmp(argv[0], "-b")) {
+			if (argc <  5 || lo.label) {
+				r = CMD_RET_USAGE;
+				goto out;
+			}
+			id = (int)simple_strtoul(argv[1], &endp, 16);
+			if (*endp != '\0' || id > 0xffff)
+				return CMD_RET_USAGE;
 
-	/* file path */
-	ret = efi_dp_from_name(argv[3], argv[4], argv[5], &device_path,
-			       &file_path);
-	if (ret != EFI_SUCCESS) {
-		printf("Cannot create device path for \"%s %s\"\n",
-		       argv[3], argv[4]);
+			sprintf(var_name, "Boot%04X", id);
+			p = var_name16;
+			utf8_utf16_strncpy(&p, var_name, 9);
+
+			/* label */
+			label_len = strlen(argv[2]);
+			label_len16 = utf8_utf16_strnlen(argv[2], label_len);
+			label = malloc((label_len16 + 1) * sizeof(u16));
+			if (!label)
+				return CMD_RET_FAILURE;
+			lo.label = label; /* label will be changed below */
+			utf8_utf16_strncpy(&label, argv[2], label_len);
+
+			/* file path */
+			ret = efi_dp_from_name(argv[3], argv[4], argv[5],
+					       &device_path, &file_path);
+			if (ret != EFI_SUCCESS) {
+				printf("Cannot create device path for \"%s %s\"\n",
+				       argv[3], argv[4]);
+				r = CMD_RET_FAILURE;
+				goto out;
+			}
+			fp_size += efi_dp_size(file_path) +
+				sizeof(struct efi_device_path);
+			argc -= 5;
+			argv += 5;
+		} else if (!strcmp(argv[0], "-i")) {
+			if (argc < 3 || initrd_dp) {
+				r = CMD_RET_USAGE;
+				goto out;
+			}
+
+			initrd_dp = create_initrd_dp(argv[1], argv[2], argv[3]);
+			if (!initrd_dp) {
+				printf("Cannot add an initrd\n");
+				r = CMD_RET_FAILURE;
+				goto out;
+			}
+			argc -= 3;
+			argv += 3;
+			fp_size += efi_dp_size(initrd_dp) +
+				sizeof(struct efi_device_path);
+		} else if (!strcmp(argv[0], "-s")) {
+			if (argc < 1 || lo.optional_data) {
+				r = CMD_RET_USAGE;
+				goto out;
+			}
+			lo.optional_data = (const u8 *)argv[1];
+			argc -= 1;
+			argv += 1;
+		} else {
+			r = CMD_RET_USAGE;
+			goto out;
+		}
+	}
+
+	if (!file_path) {
+		printf("Missing binary\n");
+		r = CMD_RET_USAGE;
+		goto out;
+	}
+
+	final_fp = efi_dp_concat(file_path, initrd_dp);
+	if (!final_fp) {
+		printf("Cannot create final device path\n");
 		r = CMD_RET_FAILURE;
 		goto out;
 	}
-	lo.file_path = file_path;
-	lo.file_path_length = efi_dp_size(file_path)
-				+ sizeof(struct efi_device_path); /* for END */
 
-	/* optional data */
-	if (argc == 6)
-		lo.optional_data = NULL;
-	else
-		lo.optional_data = (const u8 *)argv[6];
+	lo.file_path = final_fp;
+	lo.file_path_length = fp_size;
 
 	size = efi_serialize_load_option(&lo, (u8 **)&data);
 	if (!size) {
@@ -888,8 +990,11 @@ static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag,
 		printf("Cannot set %ls\n", var_name16);
 		r = CMD_RET_FAILURE;
 	}
+
 out:
 	free(data);
+	efi_free_pool(final_fp);
+	efi_free_pool(initrd_dp);
 	efi_free_pool(device_path);
 	efi_free_pool(file_path);
 	free(lo.label);
@@ -955,11 +1060,14 @@ static int do_efi_boot_rm(struct cmd_tbl *cmdtp, int flag,
  */
 static void show_efi_boot_opt_data(u16 *varname16, void *data, size_t *size)
 {
+	struct efi_device_path *initrd_path = NULL;
 	struct efi_load_option lo;
 	char *label, *p;
 	size_t label_len16, label_len;
 	u16 *dp_str;
 	efi_status_t ret;
+	efi_uintn_t initrd_dp_size;
+	const efi_guid_t lf2_initrd_guid = EFI_INITRD_MEDIA_GUID;
 
 	ret = efi_deserialize_load_option(&lo, data, size);
 	if (ret != EFI_SUCCESS) {
@@ -990,6 +1098,14 @@ static void show_efi_boot_opt_data(u16 *varname16, void *data, size_t *size)
 	printf("  file_path: %ls\n", dp_str);
 	efi_free_pool(dp_str);
 
+	initrd_path = efi_dp_from_lo(&lo, &initrd_dp_size, lf2_initrd_guid);
+	if (initrd_path) {
+		dp_str = efi_dp_str(initrd_path);
+		printf("  initrd_path: %ls\n", dp_str);
+		efi_free_pool(dp_str);
+		efi_free_pool(initrd_path);
+	}
+
 	printf("  data:\n");
 	print_hex_dump("    ", DUMP_PREFIX_OFFSET, 16, 1,
 		       lo.optional_data, *size, true);
@@ -1559,7 +1675,10 @@ static int do_efidebug(struct cmd_tbl *cmdtp, int flag,
 static char efidebug_help_text[] =
 	"  - UEFI Shell-like interface to configure UEFI environment\n"
 	"\n"
-	"efidebug boot add <bootid> <label> <interface> <devnum>[:<part>] <file path> [<load options>]\n"
+	"efidebug boot add "
+	"-b <bootid> <label> <interface> <devnum>[:<part>] <file path> "
+	"-i <interface> <devnum>[:<part>] <initrd file path> "
+	"-s '<optional data>'\n"
 	"  - set UEFI BootXXXX variable\n"
 	"    <load options> will be passed to UEFI application\n"
 	"efidebug boot rm <bootid#1> [<bootid#2> [<bootid#3> [...]]]\n"
@@ -1603,7 +1722,7 @@ static char efidebug_help_text[] =
 #endif
 
 U_BOOT_CMD(
-	efidebug, 10, 0, do_efidebug,
+	efidebug, CONFIG_SYS_MAXARGS, 0, do_efidebug,
 	"Configure UEFI environment",
 	efidebug_help_text
 );
diff --git a/doc/board/emulation/qemu_capsule_update.rst b/doc/board/emulation/qemu_capsule_update.rst
index 9fec75f8f1..33ce4bcd32 100644
--- a/doc/board/emulation/qemu_capsule_update.rst
+++ b/doc/board/emulation/qemu_capsule_update.rst
@@ -60,7 +60,7 @@ to be pointing to the EFI System Partition which contains the capsule
 file. The BootNext, BootXXXX and OsIndications variables can be set
 using the following commands::
 
-    => efidebug boot add 0 Boot0000 virtio 0:1 <capsule_file_name>
+    => efidebug boot add -b 0 Boot0000 virtio 0:1 <capsule_file_name>
     => efidebug boot next 0
     => setenv -e -nv -bs -rt -v OsIndications =0x04
     => saveenv
@@ -198,7 +198,7 @@ command line::
     3. Set the following environment and UEFI boot variables
 
         => setenv -e -nv -bs -rt -v OsIndications =0x04
-        => efidebug boot add 0 Boot0000 virtio 0:1 <capsule_file_name>
+        => efidebug boot add -b 0 Boot0000 virtio 0:1 <capsule_file_name>
         => efidebug boot next 0
         => saveenv
 
diff --git a/doc/uefi/uefi.rst b/doc/uefi/uefi.rst
index 5a67737c15..b3494c22e0 100644
--- a/doc/uefi/uefi.rst
+++ b/doc/uefi/uefi.rst
@@ -178,7 +178,7 @@ Now in U-Boot install the keys on your board::
 
 Set up boot parameters on your board::
 
-    efidebug boot add 1 HELLO mmc 0:1 /helloworld.efi.signed ""
+    efidebug boot add -b 1 HELLO mmc 0:1 /helloworld.efi.signed ""
 
 Now your board can run the signed image via the boot manager (see below).
 You can also try this sequence by running Pytest, test_efi_secboot,
diff --git a/test/py/tests/test_efi_capsule/test_capsule_firmware.py b/test/py/tests/test_efi_capsule/test_capsule_firmware.py
index f006fa95d6..e8b0a15754 100644
--- a/test/py/tests/test_efi_capsule/test_capsule_firmware.py
+++ b/test/py/tests/test_efi_capsule/test_capsule_firmware.py
@@ -39,7 +39,7 @@ class TestEfiCapsuleFirmwareFit(object):
         with u_boot_console.log.section('Test Case 1-a, before reboot'):
             output = u_boot_console.run_command_list([
                 'host bind 0 %s' % disk_img,
-                'efidebug boot add 1 TEST host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 TEST host 0:1 /helloworld.efi ""',
                 'efidebug boot order 1',
                 'env set -e OsIndications',
                 'env set dfu_alt_info "sf 0:0=u-boot-bin raw 0x100000 0x50000;u-boot-env raw 0x150000 0x200000"',
@@ -114,7 +114,7 @@ class TestEfiCapsuleFirmwareFit(object):
         with u_boot_console.log.section('Test Case 2-a, before reboot'):
             output = u_boot_console.run_command_list([
                 'host bind 0 %s' % disk_img,
-                'efidebug boot add 1 TEST host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 TEST host 0:1 /helloworld.efi ""',
                 'efidebug boot order 1',
                 'env set -e -nv -bs -rt OsIndications =0x0000000000000004',
                 'env set dfu_alt_info "sf 0:0=u-boot-bin raw 0x100000 0x50000;u-boot-env raw 0x150000 0x200000"',
@@ -188,7 +188,7 @@ class TestEfiCapsuleFirmwareFit(object):
         with u_boot_console.log.section('Test Case 3-a, before reboot'):
             output = u_boot_console.run_command_list([
                 'host bind 0 %s' % disk_img,
-                'efidebug boot add 1 TEST host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 TEST host 0:1 /helloworld.efi ""',
                 'efidebug boot order 1',
                 'env set -e -nv -bs -rt OsIndications =0x0000000000000004',
                 'env set dfu_alt_info "sf 0:0=u-boot-bin raw 0x100000 0x50000;u-boot-env raw 0x150000 0x200000"',
diff --git a/test/py/tests/test_efi_secboot/test_signed.py b/test/py/tests/test_efi_secboot/test_signed.py
index 863685e215..75f5ea7723 100644
--- a/test/py/tests/test_efi_secboot/test_signed.py
+++ b/test/py/tests/test_efi_secboot/test_signed.py
@@ -28,7 +28,7 @@ class TestEfiSignedImage(object):
             # Test Case 1a, run signed image if no PK
             output = u_boot_console.run_command_list([
                 'host bind 0 %s' % disk_img,
-                'efidebug boot add 1 HELLO1 host 0:1 /helloworld.efi.signed ""',
+                'efidebug boot add -b 1 HELLO1 host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
             assert 'Hello, world!' in ''.join(output)
@@ -36,7 +36,7 @@ class TestEfiSignedImage(object):
         with u_boot_console.log.section('Test Case 1b'):
             # Test Case 1b, run unsigned image if no PK
             output = u_boot_console.run_command_list([
-                'efidebug boot add 2 HELLO2 host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 2 HELLO2 host 0:1 /helloworld.efi ""',
                 'efidebug boot next 2',
                 'bootefi bootmgr'])
             assert 'Hello, world!' in ''.join(output)
@@ -58,13 +58,13 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000:$filesize PK'])
             assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO1 host 0:1 /helloworld.efi.signed ""',
+                'efidebug boot add -b 1 HELLO1 host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert('\'HELLO1\' failed' in ''.join(output))
             assert('efi_start_image() returned: 26' in ''.join(output))
             output = u_boot_console.run_command_list([
-                'efidebug boot add 2 HELLO2 host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 2 HELLO2 host 0:1 /helloworld.efi ""',
                 'efidebug boot next 2',
                 'efidebug test bootmgr'])
             assert '\'HELLO2\' failed' in ''.join(output)
@@ -104,7 +104,7 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000:$filesize PK'])
             assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert '\'HELLO\' failed' in ''.join(output)
@@ -142,7 +142,7 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000:$filesize PK'])
             assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert '\'HELLO\' failed' in ''.join(output)
@@ -169,7 +169,7 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000:$filesize PK'])
             assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi.signed_2sigs ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert 'Hello, world!' in ''.join(output)
@@ -227,7 +227,7 @@ class TestEfiSignedImage(object):
                 'setenv -e -nv -bs -rt -at -i 4000000:$filesize PK'])
             assert 'Failed to set EFI variable' not in ''.join(output)
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi.signed ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi.signed ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
             assert 'Hello, world!' in ''.join(output)
diff --git a/test/py/tests/test_efi_secboot/test_signed_intca.py b/test/py/tests/test_efi_secboot/test_signed_intca.py
index 70d6be00e8..0849572a51 100644
--- a/test/py/tests/test_efi_secboot/test_signed_intca.py
+++ b/test/py/tests/test_efi_secboot/test_signed_intca.py
@@ -39,7 +39,7 @@ class TestEfiSignedImageIntca(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO_a host 0:1 /helloworld.efi.signed_a ""',
+                'efidebug boot add -b 1 HELLO_a host 0:1 /helloworld.efi.signed_a ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert '\'HELLO_a\' failed' in ''.join(output)
@@ -48,7 +48,7 @@ class TestEfiSignedImageIntca(object):
         with u_boot_console.log.section('Test Case 1b'):
             # Test Case 1b, signed and authenticated by root CA
             output = u_boot_console.run_command_list([
-                'efidebug boot add 2 HELLO_ab host 0:1 /helloworld.efi.signed_ab ""',
+                'efidebug boot add -b 2 HELLO_ab host 0:1 /helloworld.efi.signed_ab ""',
                 'efidebug boot next 2',
                 'bootefi bootmgr'])
             assert 'Hello, world!' in ''.join(output)
@@ -70,7 +70,7 @@ class TestEfiSignedImageIntca(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
+                'efidebug boot add -b 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert '\'HELLO_abc\' failed' in ''.join(output)
@@ -116,7 +116,7 @@ class TestEfiSignedImageIntca(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
+                'efidebug boot add -b 1 HELLO_abc host 0:1 /helloworld.efi.signed_abc ""',
                 'efidebug boot next 1',
                 'efidebug test bootmgr'])
             assert 'Hello, world!' in ''.join(output)
diff --git a/test/py/tests/test_efi_secboot/test_unsigned.py b/test/py/tests/test_efi_secboot/test_unsigned.py
index 56f56e19eb..8e026f7566 100644
--- a/test/py/tests/test_efi_secboot/test_unsigned.py
+++ b/test/py/tests/test_efi_secboot/test_unsigned.py
@@ -35,7 +35,7 @@ class TestEfiUnsignedImage(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
             assert '\'HELLO\' failed' in ''.join(output)
@@ -64,7 +64,7 @@ class TestEfiUnsignedImage(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
             assert 'Hello, world!' in ''.join(output)
@@ -88,7 +88,7 @@ class TestEfiUnsignedImage(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
             assert '\'HELLO\' failed' in ''.join(output)
@@ -106,7 +106,7 @@ class TestEfiUnsignedImage(object):
             assert 'Failed to set EFI variable' not in ''.join(output)
 
             output = u_boot_console.run_command_list([
-                'efidebug boot add 1 HELLO host 0:1 /helloworld.efi ""',
+                'efidebug boot add -b 1 HELLO host 0:1 /helloworld.efi ""',
                 'efidebug boot next 1',
                 'bootefi bootmgr'])
             assert '\'HELLO\' failed' in ''.join(output)