Join Kevin Skoglund for an in-depth discussion in this video Directing input from a file, part of Unix for Mac OS X Users.
Now that we've seen how to change the standard output to go to a file, I'd like…to see how to direct input from a file that is instead of using our standard…input which would be our keyboard, the things that we type into the command line, …we are going to use input from a file.…Notice that I'm inside my User directory and I'm inside unix_files.…These files are in the Exercise Files as well.…The one I'm going to be using to start with is this fruit file.…You will remember what's in there.…It's just a list of fruit, all right, a bunch of unordered fruit with…duplicates in there as well.…
So what I'm going to do is I'm going to use the sort and we saw that we could do fruit.txt.…Essentially what this is doing when we call that is providing as argument…fruit.txt which the sort function then uses as its standard input.…So it's already doing what we're talking about for us, but I want to show you…the way that we can do it all the time, sort of universally for any command…that takes input, even if the input is just from the keyboard. We can then use…
- 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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