Oneliner:
<code>
LASTVAL=0; CURRVAL=0; while true; do CURRVAL=`mysqladmin status | awk {'print $6'}`; echo "QPS: $((CURRVAL-LASTVAL))"; LASTVAL=$CURRVAL; sleep 1; done
</code>

Output example:
<code>
[root@thismachine ~]# LASTVAL=0; CURRVAL=0; while true; do CURRVAL=`mysqladmin status | awk {'print $6'}`; echo "QPS: $((CURRVAL-LASTVAL))"; LASTVAL=$CURRVAL; sleep 1; done
QPS: 11429108706
QPS: 8047
QPS: 7783
QPS: 7909
QPS: 9965
QPS: 9835
^C
</code>

First output will be a very high number, as LASTVAL is 0. That can be fixed with an "if" statement, but I didn't want to include an if statement that is only used once. Keep it green, save those CPU cycles! ;P