在linux下经常遇到编码问题，有时可以统一使用iconv把编码转换一下，使用方法如下：
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
e.g:
iconv -f gbk -t utf8 -o a.txt xx.txt