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kent$ echo "abc&nbsp123" | sed -r 's#\&nbsp#\&\|nbsp#g'
abc&|nbsp123

since you didn't give much detailed description, I guess you want to do this, pls try:

under one directory, find all files (including the subdirs) containing a text pattern, then replace this...

Hi Asheesh,
Try this ...
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#!/bin/sh

#Get current time_stamp
ts=`date +%m%d%H%M`;export ts
ts=`expr $ts - 100`

#Create file with time_stamp
touch -t 0$ts...