rpm -q –scripts $INSTALLEDPACKAGE

回答你的问题：是的,MysqL-server创建了MysqL用户.

[user@server CentOS]# rpm -qp --scripts MysqL-server-5.0.77-4.el5_4.2.i386.rpm
warning: MysqL-server-5.0.77-4.el5_4.2.i386.rpm: V3 DSA signature: NOKEY,key ID e8562897
preinstall scriptlet (using /bin/sh):
/usr/sbin/useradd -M -o -r -d /var/lib/MysqL -s /bin/bash \
        -c "MysqL Server" -u 27 MysqL > /dev/null 2>&1 || :
postinstall scriptlet (using /bin/sh):
if [ $1 = 1 ]; then
    /sbin/chkconfig --add MysqLd
fi
/bin/chmod 0755 /var/lib/MysqL
/bin/touch /var/log/MysqLd.log
preuninstall scriptlet (using /bin/sh):
if [ $1 = 0 ]; then
    /sbin/chkconfig --del MysqLd
fi
postuninstall scriptlet (using /bin/sh):
if [ $1 -ge 1 ]; then
    /sbin/service MysqLd condrestart >/dev/null 2>&1 || :
fi