mysqld_safe --user=mysql &
报错（如下），但是使用mysqld直接启动没有问题。
50718 00:03:38 mysqld_safe Logging to '/var/log/mysqld.log'. 150718 00:03:38 mysqld_safe The file /usr/local/mysql/bin/mysqld does not exist or is not executable. Please cd to the mysql installation directory and restart this script from there as follows: ./bin/mysqld_safe& See http://dev.mysql.com/doc/mysql/en/mysqld-safe.html for more information [1]+ Exit 1 mysqld_safe --skip-grant-tables --user=mysql
说明：mysqld_safe启动脚本默认的从/usr/local/mysql目录中读取另外一个启动脚本mysqld，因为我的安装目录为/home/mysql/product/5.6/mysql-1。所以找不到相关文件。可以从两个方面解决。
方法一：在/usr/local/mysql创建链接文件
mkdir -p /usr/local/mysql/bin
ln -s /home/mysql/product/5.6/mysql-1/bin/mysqld /usr/local/mysql/bin/mysqld
方法二：将mysqld_safe中的所有/usr/local/mysql目录改为自己实际的安装目录
sed -i 's#/usr/local/mysql#/home/mysql/product/5.6/mysql-1#g' /home/mysql/product/5.6/mysql-1/bin/mysqld_safe