grep syntax for this...

I wanna grep for a pattern logs 1 2 & 3 within a folder containing 100 logs

grep "test" /folder/log1 /folder/log2 /folder/log3

The above command will work fine

but is there any command like

grep "test" /folder/log1, log2, log3 or something similar

grep "test" /folder/log[1-3]

Er..what if their names arent log1 log2 and log3....say if its xx yy zz..then???

Since they are within a folder

run simple grep

grep "pattern" *.*

else

find . -type f -name '*.*' -print | xargs grep -il 'pattern'
grep "test" [a-z][a-z]

or

grep "test" ??