Join Kevin Skoglund for an in-depth discussion in this video Hard links, part of Unix for Mac OS X Users.
In Unix we are going to want to make use of links.…And the first kind of links that we are going to look at in Unix are hard links.…The way that we make a hard link is just simply to have ln, short for link,…space and then the file that we want to link. That could either just be a file…name or could be a full path to a file, if the file is located somewhere else.…Followed by a space and then followed by the name of the hard link or if we…want to put that link somewhere else, the path where we want to locate it, as…if we were creating a file.…
But if we are in a single directory, than we would just put the file that we…want to link and then the hard link that we want to make to that file.…What this will do is make a reference to a file in the file system, the same…way that making a Finder alias would do.…And like the Finder, it will not break if the file is moved.…But there's one important difference about the way that hard links work.…Remember in the Finder, if we threw away the original file, the alias still is there, …
- 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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