Shell Programming and Scripting

sed 's#\([0-9][0-9]\)\([A-Z][a-z][a-z]\)\([1-2][0-9]\)\([0-9][0-9]\)#\1-\2-\4#g' file

awk 'BEGIN{
   r= "[0-9][0-9](Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Nov|Dec)[12][0-9][0-9][0-9]"
}
$0 ~ r {
while(match($0,r)){
   printf "%s-%s-%s",substr($0,1,RSTART+1),
    toupper(substr($0, RSTART+2, 3)),
    substr($0, RSTART+5,RLENGTH-5);
        $0=substr($0,RSTART+RLENGTH);
}}1 ' infile

awk 'BEGIN{
            m="Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec"
            for(i=1;i<=split(m,A);i++)Mon[A[i]]=sprintf("%02d",i)
          }
          {
		for(i=1;i<=NF;i++){
                        for(j in Mon){
                                       # example 01102012
                                       # if(gsub(j,Mon[j],$i))break
				       
				       # example 01-10-2012
				       # if(gsub(j,"-"Mon[j]"-",$i))break

				       # example 01-Oct-10 
				       if(gsub(j,"-"j"-",$i))
				       {
					 $i = substr($i,1,length($i)-4) substr($i,length($i)-1)
                                         break
                                       }
                                     }
                                  }
          }1' file

$ sed -r 's/([0-9][0-9])(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Nov|Dec)[12][0-9]([0-9][0-9])/\1-\U\2-\3/g' infile
Raheem: 20-JUN-85; Keeth: 23-DEC-13
Rakesh: 34Hgg4233 L009334622fsda
Harsha: 19-JAN-99 9849043244 Venkat: 04-MAR-00
LR224HYZA245; Ramu: 29-FEB-11