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Ok, this wiki is not only for yii projects.
The problem was that all my web applications ran normally on localhost, but on server the Greek characters (or any other no-english characters) displayed with problems.
So, I needed to remove BOM from hundreds view files of Yii from a lot of Yii projects manually. Netbeans has an option to keep files Encoding in utf-8 but not utf-8 without BOM.
My previous solution was the converting in utf-8 without BOM encoding one by one file on notepad++ consuming a lot of my time!
Many servers has not this issue but for other servers this is important. So, after of two hours searching I found a fast way to do that by commands.
(If you have windows, install cygwin first)
1) Open a shell command, go into your root folder that contains the project
2) Run this command
grep -rl $'\xEF\xBB\xBF' /home/rootfolder/Yii_project > file_with_boms.txt
3) Now, Run this one
while read l; do sed -i '1 s/^\xef\xbb\xbf//' $l; done < file_with_boms.txt
Thats it! The BOM will be removed from all files that contained it. Now you can upload your project on your server.
Note: Because I didn't use this way many times and I don't know if it works properly for all cases and files, make first a backup of your project! :)
Helped with strange characters  in output
First: Thanks a lot! Glorious hint!
Under cygwin and with the two lines, I finally found the file which always got me a cronjob response with characters like this: 
 is the BOM (Byte Order Mark) of UTF-8 files,
original it's the hexa code: EF BB BF
but it's displayed in browsers with: 
Your 2 commands worked fine :D
Re: #16349
Thanks for your comment!
Yes I had issues with Byte order mark many times!
Ι rid of this annoying triple-byte using this wiki when I forget these two commands ;)
Oneliner
Your solution uses 2 command and a middle file... to make it with one file you can use this command
~~~
find . -type f -exec sed 's/^\xEF\xBB\xBF//' -i.bak {} \; -exec rm {}.bak \;
~~~
If you want to only list the affected files you can use:
~~~
find -type f|while read file;do [ "`head -c3 -- "$file"`" == $'\xef\xbb\xbf' ] && echo "found BOM in: $file";done
~~~
If you have any questions, please ask in the forum instead.
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