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check empty variable

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Check for empty variable. proceed accordingly

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  1. if [[ -n $RELEASE]]
  2. then
  3.    SVN_DIR=/release/$RELEASE
  4.    if [ -d $SVN_DIR ]
  5.    then
  6.      echo "-------------------------------"
  7.      echo "You have chosen to build with $SVN_DIR"
  8.      echo "-------------------------------"
  9.      /home/bin/BuildRelease.sh $SVN_DIR
  10.    else
  11.      echo "the $SVN_DIR does not exist
  12.    fi
  13. fi

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