Join Kevin Skoglund for an in-depth discussion in this video Unix groups, part of Unix for Mac OS X Users.
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
Q: The exercise files for the following movies appear to be broken:
Is there something wrong with them?
These exercises include one or more "dot files", whose file names start with a period. These files are normally hidden from view by the Finder. So that they would show up in the Finder, the period has been removed from the file names. Additionally, "_example" has been added at the end of the file name to make it clear that the file will not work as-is.
To make the dot files usable, either:
1) Open the file in a text editor to view its contents. Note that it may not be possible to double-click the file to open it because there is no file extension (such as .txt).
2) Resave the file under a new name (usually by choosing File > Save As), adding a "." to the beginning of the file name and removing "_example" from the end.
1) Copy and rename the file from the Unix command line using the techniques discussed in this course. Rename the file by adding a "." to the start and removing "_example" from the end. Include the "-i" option to prevent overwriting an existing file unexpectedly.
Example: cp -i ~/Desktop/Exercise\ Files/Chapter_07/07_02_files/bashrc_example ~/.bashrc
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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