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How to replace all after 4th character in line ?

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# 1  
Old 03-12-2009
Question How to replace all after 4th character in line ?
How to replace all after 4 character at line? & convert to upper case ?

google.com -> GOOG
# 2  
Old 03-12-2009
Code:
$ cat <<EOF | awk '{print toupper(substr($0,1,4))}'
> google.com
> yahoo.com
> unix.com
> tldp.org
> EOF
GOOG
YAHO
UNIX
TLDP
$

# 3  
Old 03-12-2009
thnx ! )
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