Shell Programming and Scripting

awk 'BEGIN{FS="[:,]"}{for(i=2;i<=NF;i++)print $1":"$i}' file

awk 'BEGIN(FS="[:,]"} { if (NF == 3) print $1":"$2)' $F
awk 'BEGIN(FS="[:,]"} { if (NF == 3) print $1":"$3)' $F
awk 'BEGIN(FS="[:,]"} { if (NF == 2) print $1":"$2)' $F

bash> OIFS=$IFS; IFS=: ; while read name rest; do echo ${rest} | tr ',' '\n' | sed s/^/$name\:/g; done <your_data_filename; IFS=$OIFS

#!/usr/bin/bash
file=your_data_filename
for line in `cat $file`; do 
        name=`echo $line | cut -d':' -f1` 
        rest=`echo $line | cut -d':' -f2` 
        for i in `echo $rest | tr ',' ' '`; do
                echo ${name}:${i}
        done
done 

#!/usr/bin/bash
file=your_data_filename
for line in `cat $file`; do
        name=`echo $line | cut -d':' -f1` 
        rest=`echo $line | cut -d':' -f2` 
        echo $rest | tr ',' '\n' | sed s/^/$name\:/g
done