date formatting

Shell Programming and Scripting
1

Date format MM/DD/YYYY
required is YYYYMMDD, I tried using sed but could not get it any help please.

2 
awk '{print substr($0,7,4) substr($0,1,2) substr($0,4,2)}'

or

awk 'BEGIN {FS="/"; OFS=""} {print $3,$1,$2}'
3

try:

#!/bin/ksh

reformat()
{
    echo "$1" | tr -s '/' ' ' | read month day year
    echo "$year""$month""$day"
}

for dt in 01/10/1999 10/01/2000 12/30/2006 
do
	echo "$(reformat "$dt" )"
done
4

that worked Thanks

5 
$ echo MM/DD/YYYY | sed -e 's_^\(.\{2\}\)\/\(.\{2\}\)\/\(.\{4\}\)$_\3\1\2_'
YYYYMMDD