ls with numeric range doesn't work inside bash script

Question

I have a folder with files named as file_1.ext...file_90.ext. I can list a range of them with the following command:

$ ls /home/rasoul/myfolder/         


        

Answer 1

The range pattern {A..B} does not accept variables for A or B. You need constants for them. A workaround might be to start a subshell like this:

RESULT=$(bash -c "ls {$a..$b}")