piconv [-f from_encoding] [-t to_encoding]
      [-p|--perlqq|--htmlcref|--xmlcref] [-C N|-c] [-D] [-S scheme]
      [-s string|file...]
piconv -l
piconv -r encoding_alias
piconv -h
Common options:
  -l,--list
     lists all available encodings
  -r,--resolve encoding_alias
    resolve encoding to its (Encode) canonical name
  -f,--from from_encoding
     when omitted, the current locale will be used
  -t,--to to_encoding
     when omitted, the current locale will be used
  -s,--string string
     "string" will be the input instead of STDIN or files
The following are mainly of interest to Encode hackers:
  -C N | -c           check the validity of the input
  -D,--debug          show debug information
  -S,--scheme scheme  use the scheme for conversion
Those are handy when you can only see ASCII characters:
  -p,--perlqq         transliterate characters missing in encoding to \x{HHHH}
                      where HHHH is the hexadecimal Unicode code point
  --htmlcref          transliterate characters missing in encoding to &#NNN;
                      where NNN is the decimal Unicode code point
  --xmlcref           transliterate characters missing in encoding to &#xHHHH;
                      where HHHH is the hexadecimal Unicode code point