Join Kevin Skoglund for an in-depth discussion in this video Unix groups, part of Unix for Mac OS X Users.
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In addition to having users on a system, there is also this idea of groups in Unix.…A group is a set of users and each user belongs to at least one group, a primary group, …and it can belong to any number of other groups as well.…Groups are useful for associating a group of users with a file.…So, file's permissions can be set to allow group members to access files,…directories or commands, while making sure that people who are not members of…that group can not.…So for example in a large corporation you might have a group called Human…Resources, Legal, or Tech-Support and those users would be granted access to…certain files and then by adding a user to one of those groups, they would…automatically gain access to all of those files and you wouldn't have to manage…access user by user or file by file.…
However, setting up managing groups really applies to shared servers and…falls under Unix system administration more than Unix usage, and on the Mac you…really don't need groups that often.…You don't really use it in a multi-user environment that much.…
- Moving around the file system
- Creating and reading files
- Copying, moving, renaming, and deleting files and directories
- Creating hard links and symbolic links
- Understanding user identity, file ownership, and sudo
- Setting file permissions with alpha and octal notation
- Changing the PATH variable
- Using the command history
- Directing input and output
- Configuring the Unix working environment
- Searching and replacing using grep and regular expressions
- Manipulating text with tr, sed, and cut
- Integrating with the Finder, Spotlight, and AppleScript
Skill Level Beginner
1. Introduction to Unix
2. Filesystem Basics
3. Working with Files and Directories
4. Ownership and Permissions
5. Commands and Programs
6. Directing Input and Output
7. Configuring Your Working Environment
8. Unix Power Tools
9. Useful Mac-Only Commands and Techniques
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