Join Kevin Skoglund for an in-depth discussion in this video File and directory ownership, part of Unix for Mac OS X Users.
Now that we've talked about users and we've talked about groups, we're ready to…talk about file and directory ownership.…Ownership is an essential part of working in a multiuser environment.…It is how Unix can tell which files belong to you, which ones you can access…and which ones you can't. You can see the ownership of files and directories…whenever we do ls -la.…It's the second and third columns that you see there.…So the owner of all of these files and directories except for one is going to be kevin. …The one that you see as root is the parent directory of that.…That's the /Users directory.…
That's going to be the parent directory and it's owned by root.…But my User folder is owned by me and all the things that are inside that…folder are owned by me.…The group that owns it, or you can say the group that's assigned to it, is staff.…Now we don't need to worry too much about groups on Mac, but I just want you to…see it so that you have the conceptual understanding.…For contrast, let's take a look at the other user that I've set up on my…
- 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
The instructor uses the UNIX program 'units' to convert 72° Fahrenheit to degrees Celsius. The returned value of 40 is incorrect. The correct result should be 22°C. What's the reason for this discrepancy?
The problem is that units does the 5/9 calculation but does not have the ability to subtract 32. So you'll need to subtract (or add) the 32 degrees yourself.
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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