$ touch - && echo ok ok $ ls - ls: cannot access -: No such file or directory
$ touch -- - && echo ok ok $ ls - ls: cannot access -: No such file or directory $ : > - $ ls - -
$ touch - && echo ok ok $ ls - ls: cannot access -: No such file or directory
$ touch -- - && echo ok ok $ ls - ls: cannot access -: No such file or directory $ : > - $ ls - -