Join Kevin Skoglund for an in-depth discussion in this video grep: Multiple files, other input, part of Unix for Mac OS X Users.
What if we want to grep from multiple files or search inside directories?…There are a couple of ways to do it.…One is we could just say well, grep for Apple inside and then provide the file…path, a directory in this case.…So let's just say we're going to use the current path.…The dot represents the current path.…We could just as easily type Users/Kevin /unix_files, same thing. It comes back and says…I didn't find anything.…It's because we've given it a directory.…If we want it to do it in this way then we need to put the -R option in front…of it for recursive.…
Recursively look inside here, meaning check all of the files that are in this…directory and then go into the directories below that and look inside those and so on.…The same option that we used with copy, move, and remove earlier. So grep…recursively for apple inside this directory.…So whenever we use a directory, we want to use -R just like we did when we…were doing copying.…So now it tells me not only the matches it made but the file where it occurs.…
- 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
The instructor uses the UNIX program 'units' to convert 72° Fahrenheit to degrees Celsius. The returned value of 40 is incorrect. The correct result should be 22°C. What's the reason for this discrepancy?
The problem is that units does the 5/9 calculation but does not have the ability to subtract 32. So you'll need to subtract (or add) the 32 degrees yourself.
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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