From 5446e3cb8a4d9b6aa517fc8437ba194a9ae9b193 Mon Sep 17 00:00:00 2001
From: Eric Yang <eyang@apache.org>
Date: Mon, 18 Mar 2019 13:04:49 -0400
Subject: [PATCH] HADOOP-16167.  Fixed Hadoop shell script for Ubuntu 18.      
          Contributed by Daniel Templeton

---
 .../hadoop-common/src/main/bin/hadoop-functions.sh   | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh b/hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh
index 71ba7fffc1..e291a9b899 100755
--- a/hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh
+++ b/hadoop-common-project/hadoop-common/src/main/bin/hadoop-functions.sh
@@ -2364,6 +2364,10 @@ function hadoop_verify_user_perm
   declare command=$2
   declare uvar
 
+  if [[ ${command} =~ \. ]]; then
+    return 1
+  fi
+
   uvar=$(hadoop_build_custom_subcmd_var "${program}" "${command}" USER)
 
   if [[ -n ${!uvar} ]]; then
@@ -2395,6 +2399,10 @@ function hadoop_need_reexec
     return 1
   fi
 
+  if [[ ${command} =~ \. ]]; then
+    return 1
+  fi
+
   # if we have privilege, and the _USER is defined, and _USER is
   # set to someone who isn't us, then yes, we should re-exec.
   # otherwise no, don't re-exec and let the system deal with it.
@@ -2431,6 +2439,10 @@ function hadoop_subcommand_opts
     return 1
   fi
 
+  if [[ ${command} =~ \. ]]; then
+    return 1
+  fi
+
   # bash 4 and up have built-in ways to upper and lower
   # case the contents of vars.  This is faster than
   # calling tr.