Extract substring from a string

UNIX Solaris
1

i have srtring i.e. "NAME,CLASS,AGE" (length of string is not constant) and from this string i've extract each word delimited by "," (comma).

INPUT: "NAME,CLASS,AGE"
OUTPUT: NAME
CLASS
AGE

how can i do that?
i have tried some string manipulation function like index (echo `expr index $stringZ $var`) etc, but it seems sun solaries does not support that one.
i am using bash shell

please help, i'll appricate any kind of help.

2

There are several ways -
one is:

 echo "$string"| IFS=, read a b c
  echo $a
  echo $b
  echo $c
3

length of "string" is not fixed, it can contain any number of word like
"STD,CLASS,AGE,DEPT"
"STD,CLASS" etc

4

awk -F ',' '{ print "name " $1; print "Class" $2 }' and so on.

5

i don't know how many word it contains, i mean to say this "string" is fetched from database, now i don't know how many word there. Like some time it may contain only 2 word some time 7, meaning to say we don;t know how many word are there.

i think now you got my problem, still not then please let me know

6

Perhaps:

echo "$string" | tr ',' '\n'

If not, can you better explain what you want to achieve ?