character showing up in files. How to remove them?

You can easily remove them using vim, here are the steps:

1) In your terminal, open the file using vim:

vim file_name

2) Remove all BOM characters:

:set nobomb

3) Save the file:

:wq

备注:
所谓 BOM,全称是Byte Order Mark,它是一个Unicode字符,通常出现在文本的开头,用来标识字节序 (Big/Little Endian),除此以外还可以标识编码(UTF-8/16/32),如果出现在文本中间,则解释为zero width no-break space  yum install dos2unix -y
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