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The following are more precise perhaps (you didn't provide a ps output)
$( ps -ef | grep -c 'dw[.]sap' )
$( ps -ef | grep -wc 'dw[.]sap' )

I think this code should work, I was unable to find a way to remove last line as you mentioned.

I will try and let you know.

thanks

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You can simply use "ls -rt" to get your files sorted by date/time (instead of name) and then remove the last line (the latest file) and delete the others. Use the following blueprint:

ls -rt...

Thanks a lot Anbu it works