From: LI Huajing <huajing.li@intel.com>

Signed-off-by: Huajing Li <huajing.li@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
---
 ShellPkg/Library/UefiShellDebug1CommandsLib/SetVar.c                  | 4 ++++
 .../Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni | 1 +
 2 files changed, 5 insertions(+)

diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/SetVar.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/SetVar.c
index 8fb918d082..b7d3bbdc03 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/SetVar.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/SetVar.c
@@ -384,6 +384,10 @@ ShellCommandRunSetVar (
     } else {
       ASSERT(FALSE);
     }
+  } else if (ShellCommandLineCheckDuplicate (Package,&ProblemParam) != EFI_SUCCESS) {
+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_DUPLICATE), gShellDebug1HiiHandle, L"setvar", ProblemParam);  
+      FreePool(ProblemParam);
+      ShellStatus = SHELL_INVALID_PARAMETER;
   } else {
     if (ShellCommandLineGetCount(Package) < 2) {
       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellDebug1HiiHandle, L"setvar");  
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni b/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni
index ee726cbbd4..f733a67f0b 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni
@@ -32,6 +32,7 @@
 
 #string STR_GEN_PROBLEM           #language en-US "%H%s%N: Unknown flag - '%H%s%N'\r\n"
 #string STR_GEN_PROBLEM_VAL       #language en-US "%H%s%N: Bad value - '%H%s%N' for flag - '%H%s%N'\r\n"
+#string STR_GEN_DUPLICATE         #language en-US "%H%s%N: Duplicate flag - '%H%s%N'\r\n"
 #string STR_GEN_NO_VALUE          #language en-US "%H%s%N: Missing argument for flag - '%H%s%N'\r\n"
 #string STR_GEN_TOO_FEW           #language en-US "%H%s%N: Too few arguments.\r\n"
 #string STR_GEN_TOO_MANY          #language en-US "%H%s%N: Too many arguments.\r\n"
-- 
2.12.2.windows.2

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