#!/bin/bash
string="hello,shell,haha" 
array=(${string//,/ }) 
for var in ${array[@]}
do
  echo $var
done 

#!/bin/bash
string="hello,shell,haha"
OLD_IFS="$IFS"
IFS=","
array=($string)
IFS="$OLD_IFS"
for var in ${array[@]}
do
  echo $var
done

#!/bin/bash
string="one,two,three,four,five"
array=(`echo $string | tr ',' ' '` ) 
 
for var in ${array[@]}
do
  echo $var
done

#!/bin/bash
str='this is a good question, hello shell, look at me, show your enthusiasm'
i=1
while((1==1))
do
  splitchar=`echo $str|cut -d "," -f$i`
  if [ "$splitchar" != "" ]
  then
      ((i++))
      echo $splitchar
  else
      break
  fi
done