经过本人测试  这个可以下载安装  

http://mirror.centos.org/centos/5/os/i386/CentOS/pdksh-5.2.14-36.el5.i386.rpm

 

[root@ora11g tmp]# rpm -ivh pdksh-5.2.14-36.el5.i386.rpm
warning: pdksh-5.2.14-36.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
error: Failed dependencies:
        pdksh conflicts with ksh-20060214-1.7.i386
可能是包冲突
办法解决
#rpm -e ksh 把ksh卸载掉，如果还有包依赖关系的话，用
#rpm -ivh --nodeps pdksh  强制安装，我在centos5.3 x86_64安装
oracle 11g R2 64位时也遇到过类似问题。


[root@ora11g tmp]# rpm -e ksh

[root@ora11g tmp]# rpm -ivh pdksh-5.2.14-36.el5.i386.rpm 
warning: pdksh-5.2.14-36.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
Preparing...                ########################################### [100%]
   1:pdksh                  ########################################### [100%]
安装完成