fix bash in process control

LFtid1056/cloudfront/boot/ps_fe.sh

@@ -1,14 +1,9 @@
 #!/bin/bash
 
-# @file:    $RCSfile: ps_fe.sh,v $
-# @brief:   $ϵͳӦ<CDB3><D3A6><EFBFBD><EFBFBD>ʾ<EFBFBD><CABE><EFBFBD>̽ű<CCBD> 
-# @version: $Revision: 1.2 $
-# @date:    $Date: 2017/02/23 03:42:58 $
-# @author:  $Author: zhanchengguo $
-# @state:   $State: Exp $
-# @latest:  $Id: ps_fe.sh,v 1.2 2017/02/23 03:42:58 zhanchengguo Exp $
-
-echo "" 
+if [ -z "$FEP_ENV" ]; then
+  echo "Error: FEP_ENV is not set. Please set it first."
+  exit 1
+fi
 
 RUNTIME_CF_FILE="$FEP_ENV/etc/runtime.cf"
 
@@ -40,5 +35,3 @@ while read LINE ; do
 		fi
 	fi		
 done < $RUNTIME_CF_FILE
-
-echo ""