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su --is the same assu.umasklike 000 or it won't work.sufile inside the PATH. It's not so hard to mimic the behavior of the realsu. The super-user has been careless anyway :-)su --is NOT the same assu -:--tells an getopt(s) (or similar) option handler to stop processing the command line for further options (usefull for example if the rest contains filenames which could start with an '-'). Ie, in "rm -i -- -f" : -f is then treated as a regular argument, so here as the name of the file torm -i, and not as an additionnal-foption to thermcommand. Sosu --is justsuand notsu -! Sosu --would be as unsafe to the (funny and instructive) example givan by wag. Usesu -.