Join Kevin Skoglund for an in-depth discussion in this video xargs: Usage examples, part of Unix for Mac OS X Users.
Now that we have seen how xargs works, I want you to help you to see the power…that it gives by demonstrating some of its uses.…There's no limits what you can do with xargs, but these example should give you…an idea of how other people typically use it and get you thinking about ways to…make it work for you.…The first example I want to show you is how to use xargs with what I call File Manifest.…Notice that I am inside my user directory and inside UNIX files and in there,…there is a file called file_manifest.txt.…It's just simply a list of file names of files that are in the same current directory.…The idea here is that I have selected the files that I care about and have…arranged them in a certain order.…
Now I can use xargs to do something with those.…Now what you do with them is up to you.…You can open them, you might grep them, you might print them, or you might just…want to concatenate their contents together.…They might represent file templates that we want to copy over whenever we…start a new project.…
- 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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