Mac OS X下各种文件编码的转换方法

何曾几时本猫还在windows下编码的时候，那时ruby的源代码的编码格式都是gbk啊！导致N多中文显示为乱码。后来无奈写了个转换代码从gbk编码转为utf-8格式的小工具：

#!/usr/bin/ruby

#tool 4 gbk encoding to utf8 

src_path = $*[0]
unless src_path
	puts "usage #{$0[2..-1]} gbk_file"
	exit 1
end

dir_name,base_name = File.split(src_path)
dst_path = dir_name << '/u8_' << base_name
f_src = File.open(src_path,"r:gbk")
f_dst = File.open(dst_path,"w:utf-8")

f_src.each_with_index do |line,i|
	line.encode!("utf-8")
	if(i < 2)
		#line.gsub!(/gbk/,"utf-8") if(line =~ /^#[ ]*coding*/)
		line.gsub!(/gbk/,"utf-8") if(line =~ /^*coding*/)
	end
	f_dst.puts line
end

f_src.close
f_dst.close
`chmod +x #{dst_path}`

再后来发现mac系统下自带iconv这个好东东啊：

ICONV(1)                   Linux Programmer's Manual                  ICONV(1)

NAME

iconv - character set conversion

SYNOPSIS

iconv [OPTION...] [-f
encoding] [-t
encoding] [inputfile ...]

iconv -l

DESCRIPTION

The  iconv program converts text from one encoding to another encoding.

More precisely, it converts from the encoding given for the 
-f  option

to  the  encoding  given  for  the
-t option. Either of these encodings

defaults to the encoding of the current locale. All the
inputfiles  are

read  and  converted  in  turn;  if no
inputfile is given, the standard

input is used. The converted text is printed to standard output.

The encodings permitted are system dependent. For the  libiconv  imple-

mentation, they are listed in the iconv_open(3) manual page.

Options controlling the input and output format:

-f
encoding, --from-code=encoding

我们来试一下,创建一个utf-8格式的文本：

路人甲:最近又多学了德语，现在懂中文，英语和德语啊

猫猫：靠，我早精通十几门语言了

路人甲：擦，我才不信

猫猫：汇编语言,C语言,C++语言，C#语言,ruby语言,javascript语言...

路人甲:...

用iconv转换为gbk格式（或者反向转换也可以）：

apple@kissAir: ruby_src$iconv -f UTF-8 -t GBK ex_u8.txt > ex_gbk.txt

apple@kissAir: ruby_src$cat ex_gbk.txt

·?˼?:????ֶ?ѧ?˵?????ڶ????ģ?Ӣ??͵??ﰡ

èè?????????羫ͨʮ??????????

·?˼ף??????ҲŲ???

èè?????????,C????,C++???ԣ?C#????,ruby????,javascript????...

·?˼?:...apple@kissAir: ruby_src$

我们可以看一下iconv到底支持多少种编码格式，貌似是超多的啊：

apple@kissAir: ruby_src$iconv -l

ANSI_X3.4-1968 ANSI_X3.4-1986 ASCII CP367 IBM367 ISO-IR-6 ISO646-US ISO_646.IRV:1991 US US-ASCII CSASCII

UTF-8

UTF-8-MAC UTF8-MAC

ISO-10646-UCS-2 UCS-2 CSUNICODE

UCS-2BE UNICODE-1-1 UNICODEBIG CSUNICODE11

UCS-2LE UNICODELITTLE

ISO-10646-UCS-4 UCS-4 CSUCS4

UCS-4BE

UCS-4LE

UTF-16

UTF-16BE

UTF-16LE

UTF-32

UTF-32BE

UTF-32LE

UNICODE-1-1-UTF-7 UTF-7 CSUNICODE11UTF7

UCS-2-INTERNAL

UCS-2-SWAPPED

UCS-4-INTERNAL

UCS-4-SWAPPED

C99

JAVA

CP819 IBM819 ISO-8859-1 ISO-IR-100 ISO8859-1 ISO_8859-1 ISO_8859-1:1987 L1 LATIN1 CSISOLATIN1

ISO-8859-2 ISO-IR-101 ISO8859-2 ISO_8859-2 ISO_8859-2:1987 L2 LATIN2 CSISOLATIN2

ISO-8859-3 ISO-IR-109 ISO8859-3 ISO_8859-3 ISO_8859-3:1988 L3 LATIN3 CSISOLATIN3

ISO-8859-4 ISO-IR-110 ISO8859-4 ISO_8859-4 ISO_8859-4:1988 L4 LATIN4 CSISOLATIN4

CYRILLIC ISO-8859-5 ISO-IR-144 ISO8859-5 ISO_8859-5 ISO_8859-5:1988 CSISOLATINCYRILLIC

ARABIC ASMO-708 ECMA-114 ISO-8859-6 ISO-IR-127 ISO8859-6 ISO_8859-6 ISO_8859-6:1987 CSISOLATINARABIC

ECMA-118 ELOT_928 GREEK GREEK8 ISO-8859-7 ISO-IR-126 ISO8859-7 ISO_8859-7 ISO_8859-7:1987 ISO_8859-7:2003 CSISOLATINGREEK

HEBREW ISO-8859-8 ISO-IR-138 ISO8859-8 ISO_8859-8 ISO_8859-8:1988 CSISOLATINHEBREW

ISO-8859-9 ISO-IR-148 ISO8859-9 ISO_8859-9 ISO_8859-9:1989 L5 LATIN5 CSISOLATIN5

ISO-8859-10 ISO-IR-157 ISO8859-10 ISO_8859-10 ISO_8859-10:1992 L6 LATIN6 CSISOLATIN6

ISO-8859-11 ISO8859-11 ISO_8859-11

ISO-8859-13 ISO-IR-179 ISO8859-13 ISO_8859-13 L7 LATIN7

ISO-8859-14 ISO-CELTIC ISO-IR-199 ISO8859-14 ISO_8859-14 ISO_8859-14:1998 L8 LATIN8

ISO-8859-15 ISO-IR-203 ISO8859-15 ISO_8859-15 ISO_8859-15:1998 LATIN-9

ISO-8859-16 ISO-IR-226 ISO8859-16 ISO_8859-16 ISO_8859-16:2001 L10 LATIN10

KOI8-R CSKOI8R

KOI8-U

KOI8-RU

CP1250 MS-EE WINDOWS-1250

CP1251 MS-CYRL WINDOWS-1251

CP1252 MS-ANSI WINDOWS-1252

CP1253 MS-GREEK WINDOWS-1253

CP1254 MS-TURK WINDOWS-1254

CP1255 MS-HEBR WINDOWS-1255

CP1256 MS-ARAB WINDOWS-1256

CP1257 WINBALTRIM WINDOWS-1257

CP1258 WINDOWS-1258

850 CP850 IBM850 CSPC850MULTILINGUAL

862 CP862 IBM862 CSPC862LATINHEBREW

866 CP866 IBM866 CSIBM866

CP1131

MAC MACINTOSH MACROMAN CSMACINTOSH

MACCENTRALEUROPE

MACICELAND

MACCROATIAN

MACROMANIA

MACCYRILLIC

MACUKRAINE

MACGREEK

MACTURKISH

MACHEBREW

MACARABIC

MACTHAI

HP-ROMAN8 R8 ROMAN8 CSHPROMAN8

NEXTSTEP

ARMSCII-8

GEORGIAN-ACADEMY

GEORGIAN-PS

KOI8-T

CP154 CYRILLIC-ASIAN PT154 PTCP154 CSPTCP154

KZ-1048 RK1048 STRK1048-2002 CSKZ1048

MULELAO-1

CP1133 IBM-CP1133

ISO-IR-166 TIS-620 TIS620 TIS620-0 TIS620.2529-1 TIS620.2533-0 TIS620.2533-1

CP874 WINDOWS-874

VISCII VISCII1.1-1 CSVISCII

TCVN TCVN-5712 TCVN5712-1 TCVN5712-1:1993

ISO-IR-14 ISO646-JP JIS_C6220-1969-RO JP CSISO14JISC6220RO

JISX0201-1976 JIS_X0201 X0201 CSHALFWIDTHKATAKANA

ISO-IR-87 JIS0208 JIS_C6226-1983 JIS_X0208 JIS_X0208-1983 JIS_X0208-1990 X0208 CSISO87JISX0208

ISO-IR-159 JIS_X0212 JIS_X0212-1990 JIS_X0212.1990-0 X0212 CSISO159JISX02121990

CN GB_1988-80 ISO-IR-57 ISO646-CN CSISO57GB1988

CHINESE GB_2312-80 ISO-IR-58 CSISO58GB231280

CN-GB-ISOIR165 ISO-IR-165

ISO-IR-149 KOREAN KSC_5601 KS_C_5601-1987 KS_C_5601-1989 CSKSC56011987

EUC-JP EUCJP EXTENDED_UNIX_CODE_PACKED_FORMAT_FOR_JAPANESE CSEUCPKDFMTJAPANESE

MS_KANJI SHIFT-JIS SHIFT_JIS SJIS CSSHIFTJIS

CP932

ISO-2022-JP CSISO2022JP

ISO-2022-JP-1

ISO-2022-JP-2 CSISO2022JP2

CN-GB EUC-CN EUCCN GB2312 CSGB2312

GBK

CP936 MS936 WINDOWS-936

GB18030

ISO-2022-CN CSISO2022CN

ISO-2022-CN-EXT

HZ HZ-GB-2312

EUC-TW EUCTW CSEUCTW

BIG-5 BIG-FIVE BIG5 BIGFIVE CN-BIG5 CSBIG5

CP950

BIG5-HKSCS:1999

BIG5-HKSCS:2001

BIG5-HKSCS:2004

BIG5-HKSCS BIG5-HKSCS:2008 BIG5HKSCS

EUC-KR EUCKR CSEUCKR

CP949 UHC

CP1361 JOHAB

ISO-2022-KR CSISO2022KR

CP856

CP922

CP943

CP1046

CP1124

CP1129

CP1161 IBM-1161 IBM1161 CSIBM1161

CP1162 IBM-1162 IBM1162 CSIBM1162

CP1163 IBM-1163 IBM1163 CSIBM1163

DEC-KANJI

DEC-HANYU

437 CP437 IBM437 CSPC8CODEPAGE437

CP737

CP775 IBM775 CSPC775BALTIC

852 CP852 IBM852 CSPCP852

CP853

855 CP855 IBM855 CSIBM855

857 CP857 IBM857 CSIBM857

CP858

860 CP860 IBM860 CSIBM860

861 CP-IS CP861 IBM861 CSIBM861

863 CP863 IBM863 CSIBM863

CP864 IBM864 CSIBM864

865 CP865 IBM865 CSIBM865

869 CP-GR CP869 IBM869 CSIBM869

CP1125

EUC-JIS-2004 EUC-JISX0213

SHIFT_JIS-2004 SHIFT_JISX0213

ISO-2022-JP-2004 ISO-2022-JP-3

BIG5-2003

ISO-IR-230 TDS565

ATARI ATARIST

RISCOS-LATIN1

最后说点题外话，夸一下UNIX系统的整体性和统一性，这种统一性带来学习成本的急剧下降，而且让人很有成就感。比如我在ruby中知道正则表达式最后加i表示忽略大小写，我有次用grep查找的时候发觉也要忽略大小写查找，你猜猜我用神马选项：grep -i xxx，就是这么统一，这么和谐。windows下可以吗？哦，对了windows下人家不玩console，人家都玩窗口...