Join Kevin Skoglund for an in-depth discussion in this video Utility programs, part of Unix for Mac OS X Users.
In this movie, I want to show you several utility programs that Unix provides…that I think can be really useful to you.…We are going to look at cal and also a variation on that called ncal, which is…a calendar program.…bc, which is a calculator program.…bc stands for bench calculator.…Then we have expire, which is an expression evaluator.…essentially it's a simple one line calculator.…We are just evaluating a mathematical expression. And then units which allows us…to do units of measure conversion.…So for example, from feet to meters.…Let's try all of them out.…
We will just start with the simplest one, which is calendar.…Just type cal and look what you got.…You get the current month's calendar. That's it.…That's all it does.…It is very simple, shows you by default the current month's calendar.…So let's type in the month 12, followed by 2020. So we are going to see what…December of 2020 looks like.…As an exercise, plug in your month and year that you were born and you can see…what day of the week that you were born on.…
- 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:<br /> 07_02_files<br /> 07_03_files<br /> 07_04_files<br /> 07_05_files<br /> 08_03_files<br /><br /> 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:<br /><br /> 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).<br /> 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.<br /> <br /> OR<br /> <br /> 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.<br /> 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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