command file and iconv read and convert file encoding

solution

1. find out character encoding of a file

        $ file --mime-encoding filename
        filename: ISO-8859-1
   

2. check this kind of text encoding is supported

        $ iconv -l | grep ISO-8859-1
   

3. convert ISO-8859-1 to UTF-8

        $ iconv -f ISO-8859-1 -t UTF-8 filename > filenewname