help - print help command
quit - command to quit FS
ls [path] - list directory contents
init - init file system
read_fs - read fs_file and checks it
mkdir [path] - make directories
touch [path] - create files
open [path] - open file and return FD
close [fd] - close FD
write [fd] [data] - write data to FD
write_from [fd] [path] - read data from path and write to FD
read [fd] [size] - read size bytes from FD
read_to [fd] [path] [size] - read file from fd.pos and write data to path. If size not specified file will be readed till end
lseek [fd] [pos] - set fd.pos = pos