e.g. - '1:101' or ':101' or ':101:' for files 1 to 100 - '1::2' or '::2' for every second file - '1:101:5' or ':101:5' for files 1, 6, 11, ..., 91, 96 (the second argument specifies the first index NOT included)
e.g. - '1:101' or ':101' or ':101:' for files 1 to 100 - '1::2' or '::2' for every second file - '1:101:5' or ':101:5' for files 1, 6, 11, ..., 91, 96 (the second argument specifies the first index NOT included)