PS - For what it's worth, I'd also replace this
echo $PLEX_MEDIA_SERVER_MAX_PLUGIN_PROCS $PLEX_MEDIA_SERVER_MAX_STACK_SIZE $PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR
with something like this:
env | sort | grep PLEX
which generates much nicer startup output:
PLEX_MEDIA_SERVER_APPLICATION_SUPPORT_DIR=/config PLEX_MEDIA_SERVER_HOME=/opt/plexmediaserver PLEX_MEDIA_SERVER_MAX_PLUGIN_PROCS=3 PLEX_MEDIA_SERVER_TMPDIR=/config/tmp PLEX_MEDIA_SERVER_USER=media
but I'm not sure if env, grep, and sort are widely available. Perhaps someone could weigh in if they know? Or perhaps it's just better to make echo emulate this manually, instead of outputting a pseudo-cryptic message like "3 3000 /some/big/directory" on startup.