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Thanks alot, It worked with a slight problem..
for filename in *; do
timestamp=$(grep -o "2010[0-9]*" $filename)
cat $filename | while read line
sed 's/^/$timestamp,/' $line
#will insert $timestamp at the begginnig of every line
The timestamp insertion at the begginning of the line using sed isnt working..!!
while read filename
done < $no_of_files
$no_of_files has all the filenames present in a directory.