sudo -i
mongo -u $MDBUSER -p $MDBPASSWORD

$ sudo 'mongo $MAUTH -u $MUSER -p $MPASS'
sudo: mongo $MAUTH -u $MUSER -p $MPASS: command not found

$ sudo -i mongo $MAUTH -u $MUSER -p $MPASS
Error parsing command line: the required argument for option '--username' is missing

$ sudo env MDBAUTH="$MDBAUTH" MDBUSER="$MDBUSER" MDBPASSWORD="$MDBPASSWORD"
    bash -c 'mongo "$MDBAUTH" -u "$MDBUSER" -p "$MDBPASSWORD"'

$ sudo -i env FOO=FOO BAR=BAR bash -c 'grep -e FOO -e BAR <(set)'
BAR=BAR
BASH_EXECUTION_STRING='grep -e FOO -e BAR <(set)'
FOO=FOO
SUDO_COMMAND='/bin/sh -c env FOO=FOO BAR=BAR bash -c grep -e FOO -e BAR <(set)'
$ sudo env FOO=FOO BAR=BAR bash -c 'echo $FOO $BAR'
FOO BAR

sudo -i mongo "$MDBAUTH" -u "$MDBUSER" -p "$MDBPASSWORD"