MySQL Sandboxで./use_allをrootでやりたい

いっつも忘れるのだ！
前に使ってても忘れるのだ！
http://yoku0825.blogspot.jp/2014/11/mysql-fabric_29.html

こたえ: MYCLIENT_OPTIONS

$ ./use_all "select current_user"
# server: 1:
current_user
msandbox@localhost
# server: 2:
current_user
msandbox@localhost
# server: 3:
current_user
msandbox@localhost
# server: 4:
current_user
msandbox@localhost

$ export MYCLIENT_OPTIONS="-uroot"

$ ./use_all "select current_user"
# server: 1:
current_user
root@localhost
# server: 2:
current_user
root@localhost
# server: 3:
current_user
root@localhost
# server: 4:
current_user
root@localhost