Join Kevin Skoglund for an in-depth discussion in this video Command basics, part of Unix for Mac OS X Users.
In this chapter we are going to be taking a look at some Unix commands and…programs and seeing lots of useful things that we can do.…I want to start out by just talking about some of the basics of commands and…this is really a follow-up to the discussion we had back in Chapter 1, where we…saw the basic structure of a command.…Remember it was command, then the options, then the arguments.…I want to go a little bit deeper here and take a closer look at commands.…Let's start out with just the simplest command that we've seen so far, echo.…So echo 'Hello World,' just echoes back that string to us, right.…That's a classic command.…Now a command is actually a program.…
It's not a big program like Photoshop or Excel, but it is still a program.…We typically just call it a command.…The other thing you need to know is that commands are not somehow magic.…They're just files that you are executing.…That's all they are.…They are files that are executable and when we execute them, they do the…business of the command.…
- 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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