I cannot change directory like this
I have a problem like this:
It's because you're passing two arguments to cd
. The cd Ashikur Rahman
(notice the space) for most commands is something like two separate commands: cd Ashikur; cd Rahman
(in cd
case 2-nd argument would be just ignored though).
You'd have to enclose the part with space into quotes, like:
$ cd "Ashikur Rahman"