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How to insert the "\n" in a line?

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# 1  
Old 01-20-2005
How to insert the "\n" in a line?
Hello!
Assume I have a file. The file contain only one line, the content of the file is like:
field1,field2,field3,field4,field5,field6,field7,field8

I want to tranform that file to the following(chang to 3 lines):
field1,field2,field3,
field4,field5,field6,
field7,field8



How can I do that?
Thanks!
# 2  
Old 01-20-2005
file1 contains the data.

Code:
awk -F"," '{
 for (i=1; i<= NF; i++)
 {
    if ( i != NF )
    {
     printf ( "%s," , $i ) ;
    }
    else
    {
     printf ( "%s\n" , $i ) ;
    }
    
    if (i%3 == 0) { print("\n") }
 }
}' file1

# 3  
Old 01-20-2005
Thank you for your replay!

I have found tow methods to resolve this problem!

First
Like you

Second
sed 's/\(\([^,]*,\)\{3\}\)/\1@/g' my_file_name | tr '@' '\n'
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