Join Kevin Skoglund for an in-depth discussion in this video Setting permissions using alpha notation, part of Unix for Mac OS X Users.
Now that we understand how permissions work, how do we go about changing them?…Well, you remember with ownership, we used chown, change ownership.…We are going to use chmod to change permissions.…It stands for change mode and that's what Unix refers to the mode of these files…is being what it calls to permissions.…So chmod and then we are going to put in whatever the mode is.…I am just going to write the word mode as placeholder, we will talk about what…the mode is, followed by the file name and so we will just put file name. That's the format.…chmod, whatever changes to the mode we want, and then the file name.…
So let's look at some example of what that mode might look like.…So first, remember that we have three categories.…We have user, group, and other.…Notice the first letters of those.…u, g, and o. We are going to be using those first letters to indicate where we…want to make changes to, which category should get changes.…Okay, so u, g, and o, r, w, and, x.…So the first one I want to look at is going to be changing user, group, and…
- 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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