ora_cleansp error, /.app-modules/ora_cleansp: No such file or directory (4290302)

[oracle@spx2 bin]$ ora_cleansp
/splex/tony/.app-modules/ora_cleansp: No such file or directory

But the file exist,

$ls -rlt ora_cleansp
-rwxrwxr-x 1 oracle oracle 1441 Feb 20 10:47 ora_cleansp

Note: ksh is not installed on Redhat6 by default

1. $cd <proddir>/.app-modules

$file ora_cleansp

ora_cleansp: Korn shell script text executable

2. [oracle@spx2 bin]$ ksh
-bash: ksh: command not found

Need to install K shell (ksh), then run ora_cleansp again.

Occured on Redhat 6 version.