For when you need to quit an Eclipse running in a different X session:

shutdown_eclipse.sh

#!/bin/sh

ECLIPSE_VERSION=46
ECLIPSE_HOME= ## path to the jar referenced in the next line ##
ECLIPSE_CMDLINE_MATCH="jar ${ECLIPSE_HOME}/plugins/org.eclipse.equinox.launcher"

# This just leaves an orphan
killall eclipse${ECLIPSE_VERSION} 2> /dev/null
# This still just leaves an orphan
killall eclipse 2> /dev/null

ECLIPSE_JAVA_PID=`\
ps xo pid,cmd \
  | grep "${ECLIPSE_CMDLINE_MATCH}" \
  | grep -v grep \
  | grep -o -P '^ *\d+' \
  | grep -oP '\d*' \
  `

if [ -n "$ECLIPSE_JAVA_PID" ]
then
  # This really kills it
  kill ${ECLIPSE_JAVA_PID}
fi