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How do i check whether a file has extension?

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# 1  
Old 11-27-2007
How do i check whether a file has extension?
Hi,

How do i check whether a file has extension?

I need to code a script that will check whether a file has extension or not. Say a file Rpt200

If the file doesn't have an extenion, I need to rename the file with .txt extension. For example Rpt200 will become Rpt200.txt

Please advice.

Thanks
Sun
# 2  
Old 11-27-2007
Something like...

Code:
case `basename "$filename"` in
*.* )  
         echo has an extension
       ;;
* )
        echo does not have an extension
        filename="$filename.txt"
       ;;
esac

# 3  
Old 08-29-2008
for f in `ls |grep -v *.*`;do
> mv "$f" "$f".txt
> done
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