Getting error (stderr) su: Sorry on SunOS when calling script file from PDI 4.4.

Hi,

I am executing PDI 4.4 on Sun OS platform and calling a script file dump.sh using Execute Shell job.

dump.sh file contains a single line of command as below,

/usr/bin/su - sdpuser -c '/opt/bin/subscriberDumpTool load /opt/temp/Output/SK17SDP02'


I get the following error when I run the PDI tool

Dump the Files - ERROR (version 5.1.0.0, build 1 from 2014-06-19_19-02-57 by buildguy) : (stderr) su: Sorry

but if i run the same command on the OS prompt or call the dump.sh file directly , it executes successfully. Please advise