Join Kevin Skoglund for an in-depth discussion in this video Viewing processes, part of Unix for Mac OS X Users.
Over the course of the next few movies I want to take a look at some Unix…commands for managing processes.…Think back to Chapter 1 where we talked about the difference between the…kernel and the shell.…In our case the shell is bash.…Whenever we run a command inside our shell, a file executes and it…communicates with the kernel.…And essentially it says to the kernel, "Hey kernel!…There are some things I need to accomplish here.…Can you help me out?"…The kernel sets aside some memory space and starts a process running in it.…Then whenever there's output from that process, it returns it back to the…shell for us to see.…And whenever the process is finally done, the kernel then closes it out and…reclaims that memory space so that it can be used by other processes.…
That's what the kernel does.…it manages the processes for us.…Now we can have processes that are really short, like when we run the echo command.…That's a really, really short process. …It starts, it does its thing, and then it's over.…We could also have longer running processes.…
- 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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