I have a shell script and i pass 3 parameters to it.
Just give you an example

test.sh a=y/n b=y/n c=y/n

Pass y/n to a, b and c then it will decide what to do.

test.sh a=y b=n c=n

What i would like to do is rather then passing 3 parameter just pass a=y (only a is doing something like test.sh a=y) and skip others.
Now don't know if it is possible to look for something in parameters?
(Something like find if a,b and c have given to script always there will be one parameter).
Some scenarios

test.sh a=n b=y c=n
What i want test.sh b=y (skip a & c don't pass because no need)
test.sh a=n b=n c=y
What i want test.sh c=y (skip a & b don't pass because no need)

Thanks in advance.

I think that can be do

for i in "$@"
do
if [ `echo $i` = y ]
then
#do everything you want
fi
done

Bye

What shell? Try looking for getopts / getopt.