UNIX for Dummies Questions & Answers

arr[i]=$var1","

arr[0]=abc,
arr[1]=def,
.
.

something like this..

$ names=( Jennifer Tonya Anna Sadie )
$ for (( i = 0 ; i < ${#names[@]} ; i++ )) do  names[$i]=${names[$i]}","; done

$ for (( i = 0 ; i < ${#names[@]} ; i++ )) do  echo ${names[$i]}","; done
Jennifer,
Tonya,
Anna,
Sadie,

$ for var1 in a b c d e f; do echo $var1; done
a
b
c
d
e
f
$ for var1 in a b c d e f; do final=${final}","${var1}; done
$ echo $final
,a,b,c,d,e,f

Get_Col_Diff() 
{
REF_MAP=$REF_MAP
while read line 
do 
#use of temporary variables for comparing column values 
    var1=$(echo $line |cut -d ';' -f1)
    var2=$(echo $line |cut -d ';' -f2)
    var3=$(echo $line |cut -d ';' -f3)
    var4=$(echo $line |cut -d ';' -f4)

    if [ "$var1" = "$var3" ]; then
        arr_CommonIndex[i]=$var2
        arr_CommonCol[i]=$var1
        i=$((i+1))
    else
        added_arr_colnme[j]=${var1}","
        j=$((j+1))
    fi    
done < $REF_MAP
echo ${added_arr_colnme[*]}
}