Join Kevin Skoglund for an in-depth discussion in this video Setting permissions using octal notation, part of Unix for Mac OS X Users.
In the last movie we learned how to work with file permissions and to use chmod…to change the permissions that we wanted for user, group, and other, and to do…that we used what we called alpha notation.…That's because we're using the alphabet, u, g, and o for user, group, and other…and r, w, and x for read, write, and execute.…That's everything you need to know to change file permissions. That's it.…You could get by do everything with that.…However, I want you to also learn about octal notation, because it's extremely popular.…It's the way that I change file permissions and I think a lot of other Unix…users do and you're bound to run into it.…
So I want you to at least have some exposure to it.…So remember here we have u, g, and o, r, w, and x and we use that to come up…with those nine digits rwx, rw-, r--, right?…Now imagine that for r, w, and x that we establish a conversion. Each one of…those letters is instead going to be represented by a number, 4, 2, and 1.…r=4, w=2, x=1. So in place of the yes's and no's for each one of those, let's…
- 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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