• LaunchBar can really revolutionize the way you use your computer. The Help resources are useful, but it will take time to learn how to best use the full functionality of this program. Mc launcher.
Viewing Traditional UNIX Permissions. Once again, the ls command is your primary tool for viewing file and folder information in the command line. The ls command has many options for viewing nearly any file or folder attribute. The utility Reset Password can also be used to reset home folder permissions. Screen shot courtesy of Coyote Moon, Inc. 
Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About.com. He is the president of Coyote Moon, Inc. Updated October 01, 2018 Your. If my application creates a temporary folder within the Documents directory it is going to need user permission to do so. And then when the application cleans up after itself and removes the temporary folder and files, the next time the application runs it's going to need to ask for permissions once again.
• Overview • Transcripts • Exercise Files • Course Transcript Now that we understand file and directory ownership, we are ready to look at file and directory permissions. The way that we see permissions is using the ls -la, just like we did for owner, to show us the full listing. Notice that I am already inside my user directory inside the unix_files folder. In this listing, we just got through talking about the owner column, the column where it says kevin over and over and then the one where it says staff that's the group column.
What I want to talk about now is that very first block there, all the rws and dashes that are there. The very first character that you see we already said was an indicator of whether or not it's a directory, a file, or a link. D for directory, dash for file, l for symbolic link.
The next nine characters after that is a notation that indicates the permissions for each of these files and directories. Insert excel longish table into word for mac. So before we can go about changing the permissions, we need to understand what these symbols are trying to tell us about the current permissions. So we need to know how to decode them. We refer to this system as being alpha notation because we are using the alphabet to describe the different permissions. Imagine that we have three categories. We have our user.
Which is our owner category. We are going to call it user. That's the first category. The second one is group, everyone who belongs to the group, and then the third category is other. That's everyone else who might have access to this file. So user, group, and other are our three categories. And for each of them we can set three kinds of permissions.
We can set read permissions, whether or not you can read the contents of a file or a directory. Write, whether or not we can actually make changes to a file or make changes to a directory. And then execute, which for a file would mean that we could run it like a program or a script. For a directory, it means that we can search inside of it. That's what it means to be able to execute on a directory.
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Notice in this table that I've got yes's and no's, indicating which permissions I'd like to give each of these three categories. So I want the owner of the file to be able to read, write, and execute a file.
The group, I'd like to just be able to read and write it. They can't execute it. For everyone else, they can only read it. I don't want them to make changes. So the only people should be able to make changes are the user and the group. So what we do for each of those, read, write, and execute, is we use the letter r, w, or x to indicate it and then we essentially add them up, so that what we end up with for the user is r, w, and x and they can do all three things. The group is r and w, but not an x and we put a placeholder dash in place of it.
For everyone else, they can only read. So they get r and two dashes.
Notice now we have nine characters. You take all of those, you smash them together, and that is the nine-character permission string that we are seeing in our directory listing. So for example, if we take this file lorem_ipsum.txt, you can see that its permissions allow me, the owner, to read and write to the file but not execute it and that's fine.