Hi ,
I tried to to implement you suggestion, as follow:

ListOfFilesToImport="/${SOURCE_ORACLE_SID}/TTS/ListOfFilesToImport.lst"
tr -s '\n' ',' $ListOfFilesToImport $ListOfFilesToImport.tmp; mv $ListOfFilesToImport.tmp $ListOfFilesToImport

But got the follwoing error:
Usage: tr [ -c | -cds | -cs | -ds | -s ] [-A] String1 String2
tr [ -cd | -cs | -d | -s ] [-A] String1
mv: /tsdwh/TTS/ListOfFilesToImport.lst.tmp: cannot access: No such file or directory

Any Suggesion ?