June 2006
Intermediate to advanced
64 pages
2h 42m
English
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Restricted Shells
A restricted shell is one that disallows
certain actions, such as changing directory, setting PATH, or running
commands whose names contain a /
character.
The original V7 Bourne shell had an undocumented restricted mode. Later versions of the Bourne shell clarified the code and documented the facility. Bash also supplies a restricted mode. (See the manual page for the details.)
Shell scripts can still be run, since in that case the restricted shell calls the unrestricted version of the shell to run the script. This includes the /etc/profile, $HOME/.profile, and other startup files.
Restricted shells are not used much in practice, as they are difficult to set up correctly.
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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.