When we run command "alias cat" Shell print out "alias: Too few arguments". 
This patch makes value of single alias name can be displayed.

Cc: Jaben Carsey <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <[email protected]>
---
 ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c 
b/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c
index 1161746..bcd14c8 100644
--- a/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c
+++ b/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c
@@ -2,7 +2,7 @@
   Main file for Alias shell level 3 function.
 
   (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
-  Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved. <BR>
+  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved. <BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD 
License
   which accompanies this distribution.  The full text of the license may be 
found at
@@ -92,6 +92,8 @@ ShellCommandRunAlias (
   CONST CHAR16        *Param1;
   CONST CHAR16        *Param2;
   CHAR16              *CleanParam2;
+  CONST CHAR16        *ConstAliasVal;
+  BOOLEAN             Volatile;
 
   ProblemParam        = NULL;
   ShellStatus         = SHELL_SUCCESS;
@@ -165,8 +167,19 @@ ShellCommandRunAlias (
         }
       }
     } else if (ShellCommandLineGetCount(Package) == 2) {
-      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), 
gShellLevel3HiiHandle, L"alias");  
-      ShellStatus = SHELL_INVALID_PARAMETER;
+      //
+      // print out a single alias
+      //
+      ConstAliasVal = gEfiShellProtocol->GetAlias(Param1, &Volatile);
+      if (ConstAliasVal == NULL) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PARAM_INV), 
gShellLevel3HiiHandle, L"alias", Param1);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else {
+        if (ShellCommandIsOnAliasList(Param1)) {
+          Volatile = FALSE;
+        }
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ALIAS_OUTPUT), 
gShellLevel3HiiHandle, !Volatile?L' ':L'*', Param1, ConstAliasVal);
+      }      
     } else {
       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), 
gShellLevel3HiiHandle, L"alias");  
       ShellStatus = SHELL_INVALID_PARAMETER;
-- 
1.9.5.msysgit.1

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