Thanks for the response. I had already seen that web page and had tried
it but unfortunately didn't work (the SQL*loader fails).
Basically I did the following steps:
Open the ucs-2le file in vim
Save as utf-8
Run awk to generate new file
Open new file as utf-8 in vim
Save as ucs-2le
SQL*Load the new file.
So, in general awk and sed do not support ucs2le or utf-16 encodings? Therefore to use them an explcit conversion is required?