Join Kevin Skoglund for an in-depth discussion in this video Setting the PATH variable, part of Unix for Mac OS X Users.
We first took a look at the path variable back in Chapter 5.…You can jump back there if you need a quick refresher.…Path is a colon delimited list of file paths that Unix uses when it's trying to…locate a command that you want it to run.…And we can take a look at that with echo $PATH.…There you see each of the paths that it's going to check in.…For example, /usr/bin and then a colon followed by the next path /bin and then a…colon and so on down the line.…And Unix will look in each of those directories, trying to locate a command in that order.…So for example, if we type less unix_ files/lorem_ipsum.txt, then the process…that Unix went through when trying to run the LESS command was to first look…for it in this directory and then if it didn't find it, to look for it in this…directory, and so on all the way down the line.…
In this movie I want to still learn to modify our path variable using what we…just learned in the last movie about setting environment variables.…To begin with, let's just do it here from the command line. PATH= and we'll…
- 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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