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95
votes
2answers
24k views

Why do we use su - and not just su?

I don't understand why su - is preferred over su to login as root.
48
votes
16answers
8k views

Why do Unix-heads say “minus”?

A couple of weeks ago I attended a talk on Git by someone who seemed to be from a Windows background. I say "seemed to be" because he kept saying "dash" when referring to command-line options. I ...
48
votes
2answers
8k views

Why are shared libraries executable?

Why have almost all the shared libraries in /usr/lib/ have the executable permission bit set? I don't see any use case for executing them. Some do manage to hook-up some form of main function to print ...