June 2005
Intermediate to advanced
1560 pages
45h 7m
English
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Being Someone Else for a While: su, sudo
Because Unix is a multiple user operating system, it's sometimes convenient to be able to momentarily switch user IDs so that you can do something as a different user than the one you're currently logged in as. To eliminate the need to log out and log back in under an alternative ID, Unix provides the su command (meaning switch user), which allows you to briefly act as another user for whom you know the login password. The su command is often used to switch to the root user ID for the purpose of performing system maintenance, but it can also be used to switch to any other user ID on the system.
The su command can be dangerous. When you are running as another user, you have all the permissions that the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.