how to write for loop

Shell Programming and Scripting
1

Hi All,
I have one variable "TABLE_LIST" having the values and each valeus i can run in for loop like below:

TABLE_LIST= abc,abcd,acbfd

i should write the for loop and use each value at a time .

Please help me

Thanking in advance ..............

Regards,
Dathu

2

You can make it split on "," by changing the special IFS variable:

VAR="a,b,c,d,e"
OLDIFS="$IFS"
IFS=","
for V in $VAR
do
        echo $V
done

IFS="$OLDIFS"
3

i didn't understand ur code. Why yor are using OLDIFS.

Can i write code the below:

for EACH_TEBLE in $TABLE_LIST
do
if [[ EACH_TEBLE == "abc"]] then
......
elif [[ EACH_TEBLE == "abcd"]] then
......
else .....
done

The above code is correct?

4

OLDIFS is used to keep the original IFS, and roll it back after run the script.

5

So you can set the special variable IFS to what it used to be before you changed it. It defaults to any whitespace. Changing it to "," lets you split on "," instead, like the ,'s in your string.

It won't work without setting IFS="," first. That's what causes it to split $TABLE_LIST instead of considering it one big string.