function setjdk() {
    if [ $# -ne 0 ]; then
        removeFromPath '/System/Library/Frameworks/JavaVM.framework/Home/bin'
        if [ -n "${JAVA_HOME+x}" ]; then
            removeFromPath $JAVA_HOME
        fi
        export JAVA_HOME=`/usr/libexec/java_home -v $@`
        export PATH=$JAVA_HOME/bin:$PATH
    fi
}
function removeFromPath() {
    export PATH=$(echo $PATH | sed -E -e "s;:$1;;" -e "s;$1:?;;")
}
setjdk 1.8

// the following is a script to copy aws mongo data to my local mongod.
#!/bin/bash

for i in `all the collections in app database`
do
  mongoexport -h aws-mongod:port -d app -u user -p passwd -c $i | mongoimport -d app -c $i --drop -h localhost:27017
done