Join Kevin Skoglund for an in-depth discussion in this video The PATH variable, part of Unix for Mac OS X Users.
In the last movie, we saw how commands and programs are really just files that…are being executed, and we saw that we type echo 'Hello world' that what it's…actually doing is executing a file that is located in bin/echo.…I write the argument.…Those are doing exact same thing.…This is just a shortcut for finding this file and executing it.…So how does Unix do that?…How does Unix know to find echo in this location or to put it another way,…if I create another file named echo, how does Unix know not to use that one…instead, or what if I wanted it to use that one instead?…How would I go about doing that?…Well, the way that Unix manages all of this is with a variable called PATH.…
$PATH will show you the current value of your path and the path is always a…colon-separated list of file paths and this is the list that Unix will use when…trying to locate commands to execute.…The early entries take precedence over the later ones.…So what it does is it starts at the left.…When we type echo, it says, "Oh! I'll look in user bin.…
- 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
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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