Mac自带编码转换工具iconv

iconv --help

Usage: iconv [OPTION...] [-f ENCODING] [-t ENCODING] [INPUTFILE...]
or:    iconv -l

Converts text from one encoding to another encoding.

Options controlling the input and output format:
  -f ENCODING, --from-code=ENCODING
                              the encoding of the input  #要准换的文件
  -t ENCODING, --to-code=ENCODING
                              the encoding of the output

Options controlling conversion problems:
  -c                          discard unconvertible characters . # 忽略无法识别的错误参数
  --unicode-subst=FORMATSTRING
                              substitution for unconvertible Unicode characters
  --byte-subst=FORMATSTRING   substitution for unconvertible bytes
  --widechar-subst=FORMATSTRING
                              substitution for unconvertible wide characters

Options controlling error output:
  -s, --silent                suppress error messages about conversion problems

Informative output:
  -l, --list                  list the supported encodings
  --help                      display this help and exit
  --version                   output version information and exit

Report bugs to <bug-gnu-libiconv@gnu.org>.

　　

示例：

iconv -f utf-8 -t gb2312 -c a.txt > c.txt

转换成功的文件，在terminal中用 open . 命令打开当前文件夹，将转换的c.txt扔到浏览器上，查看转换编码结果。