linux backup mysql

1、在linux系统通过脚本安装程序时，提示：
-bash: ./setup.sh: /bin/ksh: bad interpreter: No such file or directory

原因：系统没有安装ksh。

# yum  install  ksh

2、 mysqldump: not found [No such file or directory]

ln -s /usr/local/mysql/bin/mysqldump /usr/bin