name=@col1, zip_cd=@col2, district=@col3, city=@col4

@col1,@col2,@col3,@col4

$ array=($name $zip_cd $district $city)

$ oIFS="$IFS" # save IFS for later
$ IFS=","
$ echo ${array[*]}
@col1,@col2,@col3,@col4
$ IFS="$oIFS"`enter code here`

$ line="foo bar qaz qux"
$ oIFS="$IFS" # save IFS for later
$ IFS=" " # space, if $line has spaces/tabs, convert them into single spaces below
$ line=`sed 's/s+/ / <<< $line`
$ array=($line)
$ IFS="," # for display
$ echo ${array[*]}
foo,bar,qaz,qux

$ myvar='name=@col1, zip_cd=@col2, district=@col3, city=@col4'


$ echo $myvar
name=@col1, zip_cd=@col2, district=@col3, city=@col4

$ echo $myvar | awk -F, '{for(i=1;i<=NF;i++){split($i,a,"=");printf("%s,",a[2])}}'
@col1,@col2,@col3,@col4

echo "name=@col1, zip_cd=@col2, district=@col3, city=@col4" | awk 'BEGIN{FS="[^=,]*=";OFS=""} {$1=$1}1'

var='name=@col1, zip_cd=@col2, district=@col3, city=@col4'

newvar=$( printf '%s' "$variable" | awk 'BEGIN { RS=" "; ORS=""; FS="=" } { print $2 }' )

printf '%sn' "$newvar"
@col1,@col2,@col3,@col4

name=@col1,
zip_cd=@col2,
district=@col3,
city=@col4

name     @col1,
zip_cd   @col2,
district @col3,
city     @col4

VAR='name=@col1, zip_cd=@col2, district=@col3, city=@col4'
echo "$VAR" |
while IFS= read -r line
do
   IFS='=,'; set -f; set -- $line
   while case $# in 0 ) break ;; esac
   do
      shift
      printf '%s' "${1}${2+,}"
      shift
      ${1+':'} echo
   done
done

echo "$VAR" |
sed -ne '
   H;g
   :loop
      s/(n)[^=]*=([^,]*,{0,1})/21/
   tloop
   P
'

echo "$VAR" |
perl -F'/=|,/' -lpe '
   $_ = join ",", grep { $a++ % 2 } @F;
'