Navigating directories with * / . and ..

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http://www.unix.com – I would be very happy (after a lot of fruitless searching) if someone could explain the meaning of these variations on the ls command: ls */ ls */. ls */./ I understand the basic use of ls already eg ls -al but am wanting to list from different points in the file structure without having to leave the directory I am in and my experimenting has left me confused. Also in the examples above what is the correct term for the characters after the "ls"? Are they correctly called operators? Or is that the wrong term? Thanks. (HowTos)