Plain text files do not have a charset tag. If the files are not in UTF-8 encoding, encoding conversion is needed. Use the iconv utility to perform the encoding conversion. For example, to convert a plain text file encoded in Traditional Chinese big5 to UTF-8, execute the following command: iconv -f big5 -t UTF-8 inputfilename > outputfilename
Alternatively, you can use File System Examiner
to perform the encoding conversion. To start File System Examiner, click Launch, then choose Applications -> Utilities -> File System Examiner.
You can use Text Editor to read and write
text files with various character encoding text automatically, so that you
do not need to perform a manual conversion. You can also specify an encoding
explicitly when you open or save a file in Text Editor.
To start Text Editor, click Launch,
then choose Applications -> Accessories -> Text Editor.