Join Kevin Skoglund for an in-depth discussion in this video The root user, part of Unix for Mac OS X Users.
So far in this chapter we've been talking about user accounts and user privileges.…The things that a user is or is not allowed to access on the Unix file system.…Now I like us to talk about a special kind of Unix account, which is the root user.…The root user is a super user account that can do absolutely anything on the Unix system.…It can open any file, it can run any program, it can change any permissions.…It is an all-powerful user that's not bound by the normal user permissions that…we've been discussing so far.…So the root user can see Lynda's photos and they can read Kevin's documents.…
In fact, they can even delete Kevin and Lynda's accounts.…When Unix is first installed on a computer, it's this root user that exists…before you've even created the user accounts.…So as the root user, you would first create Kevin's account, give him a…password, and then from then on we can log in as Kevin.…Now in Mac OS X, you don't see that process happen, because the Mac OS X…installer does it for you.…
- 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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