This function executes a ubuntu docker that counts row and colums of a counts table.
dimensions(group = c("sudo", "docker"), scratch.folder, file, separator)
a character string. Two options: sudo or docker, depending to which group the user belongs
a character string indicating the path of the scratch folder
a character string indicating the path of the file, with file name and extension included
separator used in count file, e.g. '\t', ','
a file called dimensions.txt containing the number of row and columns of a cells counts table