xp_cmdshell IQ 16 - Not working

I am running a xp_cmdshell to cat a HDFC file into a FIFO pipe in IQ - but the command keeps running for ever and I don't see any  process in the linux side and nothing on the iqmsg.

Other way I tried was to create an event and trigger than event as presented out in the below link

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/109181ef-1f84-3010-feac-9c99f0d667a7?QuickLink=index&overridelayout=true&58321360934575

But in this case it runs and returns with zero rows as the FIFO created does not contain any record.

it looks like xp_cmdshell is not going through

Any idea whats happening?

Regards

VB