Hi
I am looking to rename the contents of this dir, each one with a new timestamp, interval of a second for each so it the existing format is on lhs and what I want is to rename each of these to what is on rhs..hopefully it nake sense

CDR.20060505.150006.gb    CDR.20121211.191500.gb
CDR.20060505.150109.gb    CDR.20121211.191501.gb
CDR.20060505.150216.gb    CDR.20121211.191502.gb
CDR.20060505.150308.gb    CDR.20121211.191503.gb

How about?

for file in CDR*.gb
do
        echo "mv $file CDR.$( date +'%Y%m%d.%H%M%S' ).gb"
        sleep 1
done

mv "$file" "CDR.$( date +'%Y%m%d.%H%M%S' ).gb"

sed is not the be-all and end-all of text. I'm not sure what I'd even use it for here since you're just replacing everything with everything...

read YYYYMMDD HH MM SS <<EOF
`date '+%Y%m%d %H %M %S'`
EOF

[ "${HH:0:1}" = "0" ] && HH="${HH:1}"
[ "${MM:0:1}" = "0" ] && MM="${MM:1}"
[ "${SS:0:1}" = "0" ] && SS="${SS:1}"

for FILE in *.gb
do
        echo mv "$FILE" "$YYYY-$HH$MM$SS.gb"

        let SS=SS+1

        [ "$SS" -gt 59 ] && SS=0 && let MM=MM+1
        [ "$MM" -gt 59 ] && MM=0 && let HH=HH+1
        [ "$HH" -gt 23 ] && HH=0
done

Thank you so much, that 1s 100% exactly what i was after. My approach was much different tyring to use sed and more complex solutions
Thanks again

---------- Post updated at 02:40 PM ---------- Previous update was at 02:39 PM ----------

Thank you Corona688 for your response,. You are correct in that bipinajith' solution is far simpler.