Join Kevin Skoglund for an in-depth discussion in this video Screen capture, part of Unix for Mac OS X Users.
In this movie we're going to learn to take screen captures from the command line.…Do you already know how to do screen captures in the Mac?…It's simple. You just hold down the Command key, the Shift key and hit the number…3 key and it will take a screenshot of your screen and put it on your Desktop.…There is another version of that. If you hold down Command+Shift+4 you'll get an…interactive screen capture which means that you get crosshairs.…You select exactly the portion of the screen that you wanted to capture and when…you let go just that portion of the screen gets turned into a capture as a file…on your Desktop. We can do the exact same thing from the command line plus…there are a few extra options that we don't normally have available to us.…
Let's see at its most basic first.…From the command line you just simply type screencapture. It's that easy. Followed…by the name of the file where you want it to go.…So screencapture and let's put it on our Desktop and then I'm going to call…it screen_capture.png.…
- 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
The instructor uses the UNIX program 'units' to convert 72° Fahrenheit to degrees Celsius. The returned value of 40 is incorrect. The correct result should be 22°C. What's the reason for this discrepancy?
The problem is that units does the 5/9 calculation but does not have the ability to subtract 32. So you'll need to subtract (or add) the 32 degrees yourself.
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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