Linux › Section A · The big picture › Topic A.4
User space and users
Almost everything you notice on a Linux system, from the shell to the web server, happens in user space. This topic shows how the processes there are organised and how users, groups and the superuser decide who may do what.
In this topic
- Where the action happens
- Layers inside user space
- Worked example: one web request across user space
- The Unix way of building tools
- Users and user IDs
- Worked example: reading the id command
- Owners and boundaries
- Groups
- The superuser
- Common mistakes to avoid
- Key takeaways
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