一、获取iconv命令的帮助及命令参数信息

[root@CentOS-78 covers]# iconv --help
Usage: iconv [OPTION...] [FILE...]
Convert encoding of given files from one encoding to another.

 Input/Output format specification:
  -f, --from-code=NAME       encoding of original text
  -t, --to-code=NAME         encoding for output

 Information:
  -l, --list                 list all known coded character sets

 Output control:
  -c                         omit invalid characters from output
  -o, --output=FILE          output file
  -s, --silent               suppress warnings
      --verbose              print progress information

  -?, --help                 Give this help list
      --usage                Give a short usage message
  -V, --version              Print program version

Mandatory or optional arguments to long options are also mandatory or optional
for any corresponding short options.

For bug reporting instructions, please see:
<http://www.gnu.org/software/libc/bugs.html>.

二、得到iconv所支持的字符类型

[root@CentOS-78 covers]# iconv -l
The following list contain all the coded character sets known.  This does
not necessarily mean that all combinations of these names can be used for
the FROM and TO command line parameters.  One coded character set can be
listed with several different names (aliases).

  437, 500, 500V1, 850, 851, 852, 855, 856, 857, 860, 861, 862, 863, 864, 865,
  866, 866NAV, 869, 874, 904, 1026, 1046, 1047, 8859_1, 8859_2, 8859_3, 8859_4,
  8859_5, 8859_6, 8859_7, 8859_8, 8859_9, 10646-1:1993, 10646-1:1993/UCS4,
  ANSI_X3.4-1968, ANSI_X3.4-1986, ANSI_X3.4, ANSI_X3.110-1983, ANSI_X3.110,
  ARABIC, ARABIC7, ARMSCII-8, ASCII, ASMO-708, ASMO_449, BALTIC, BIG-5,
  BIG-FIVE, BIG5-HKSCS, BIG5, BIG5HKSCS, BIGFIVE, BRF, BS_4730, CA, CN-BIG5,
  CN-GB, CN, CP-AR, CP-GR, CP-HU, CP037, CP038, CP273, CP274, CP275, CP278,
  CP280, CP281, CP282, CP284, CP285, CP290, CP297, CP367, CP420, CP423, CP424,
  CP437, CP500, CP737, CP775, CP803, CP813, CP819, CP850, CP851, CP852, CP855,
  CP856, CP857, CP860, CP861, CP862, CP863, CP864, CP865, CP866, CP866NAV,
  CP868, CP869, CP870, CP871, CP874, CP875, CP880, CP891, CP901, CP902, CP903,
  CP904, CP905, CP912, CP915, CP916, CP918, CP920, CP921, CP922, CP930, CP932,
  CP933, CP935, CP936, CP937, CP939, CP949, CP950, CP1004, CP1008, CP1025,
  CP1026, CP1046, CP1047, CP1070, CP1079, CP1081, CP1084, CP1089, CP1097,
  CP1112, CP1122, CP1123, CP1124, CP1125, CP1129, CP1130, CP1132, CP1133,
  CP1137, CP1140, CP1141, CP1142, CP1143, CP1144, CP1145, CP1146, CP1147,
  CP1148, CP1149, CP1153, CP1154, CP1155, CP1156, CP1157, CP1158, CP1160,
  CP1161, CP1162, CP1163, CP1164, CP1166, CP1167, CP1250, CP1251, CP1252,
  CP1253, CP1254, CP1255, CP1256, CP1257, CP1258, CP1282, CP1361, CP1364,
  CP1371, CP1388, CP1390, CP1399, CP4517, CP4899, CP4909, CP4971, CP5347,
  CP9030, CP9066, CP9448, CP10007, CP12712, CP16804, CPIBM861, CSA7-1, CSA7-2,
  CSASCII, CSA_T500-1983, CSA_T500, CSA_Z243.4-1985-1, CSA_Z243.4-1985-2,
  CSA_Z243.419851, CSA_Z243.419852, CSDECMCS, CSEBCDICATDE, CSEBCDICATDEA,
  CSEBCDICCAFR, CSEBCDICDKNO, CSEBCDICDKNOA, CSEBCDICES, CSEBCDICESA,
 ... ...

如果想要查询所支持的某一类字符类型，可以通过grep命令进行过滤。

三、应用举例

1. 文件装换

iconv -f ISO88592 -t UTF8 < input.txt > output.txt

ISO88592：原编码格式

UTF8：要转换的编码格式

2. 转换网页

curl -s http://www.dreamdu.com/ | iconv -f utf8 -t gbk
curl -s http://www.google.com.hk/ | iconv -f big5 -t gbk

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参考文献：

        http://linux.die.net/man/1/iconv

        http://codingstandards.iteye.com/blog/807077