Changes character encoding of a given document. If no document is given, the command applies to the current document. This has two effects: changing the XMLDecl encoding declaration in the document prolog to display the new encoding and making all future save operations on the document default to the given charset.
ls<?xml version="1.0" encoding="iso-8859-1"?> <foo>...</foo> xsh>
ls<?xml version="1.0" encoding="utf-8"?> <foo>...</foo> xsh>
save# saves the file in UTF-8 encoding