What is umask 002

What is "umask" and how does it work? Ask Question. Asked 10 years, 5 months ago. Active 4 months ago. Viewed k times. What is umask exactly? Explain it to me like I was a "Linux noob" How do I calculate with umask? What are use cases for umask? Improve this question.

Community Bot 1. Lekensteyn Lekensteyn k 61 61 gold badges silver badges bronze badges. Add a comment. Active Oldest Votes. Use case: multi-user system If you are on a system that's shared by multiple users, it's desired that others cannot read files in your home directory. Improve this answer. So, what do the digits in the umask mean? Why does mean that the group and others will be able to write to it, while means they can't?

Also, you say that if the umask is , the file permission will be So with a default mask of , shouldn't the file permissions be , i. Must admit, this explanation confused me more than it did help me.

HelloGoodbye if the umask is then no permissions will be removed. Show 3 more comments. If they are already off, the umask makes no change to the permission, For example, assume that you have to unmask from the system defaults for files which is and directories which is The command you will use is umask unmask value in binary, What this unmask will do is it will turn off any of the first six LSBs least significant bits if they are 1 and will make no change if any of them are already off.

BaseZen 3 3 bronze badges. Sufiyan Ghori Sufiyan Ghori 6 6 silver badges 8 8 bronze badges. SufiyanGhori So if umask , it will turn off first 7 least significant bits if they are 1 — Kasun Siyambalapitiya. EricHodgins : Yes, exactly. Show 2 more comments. Make sure you also take a look at our Linux command cheat sheet for more commonly used Linux commands. Introduction When creating a new file or directory, Linux applies the default set of permissions.

Was this article helpful? With a background in both design and writing, he aims to bring a fresh perspective to writing for IT, making complicated concepts easy to understand and approach. Next you should read. DevOps and Development SysAdmin. The disown command is a part of the default Unix shell. You can use it to delete jobs or keep them running Networking SysAdmin.

Active Oldest Votes. There is no difference between umask and umask Improve this answer. Community Bot 1 1 1 silver badge. The Overflow Blog. Podcast The first ten years of our programming lives. Upcoming Events.

Featured on Meta. Consider above values are inverse to actual permissions. Owner will get full permission, group gets execute and write permissions and others no permissions.

In other words and simple way.. We have to subtract from , then we will get the actual folder permissions. For your understanding purpose we have calculated this below equation to get what actual AND operator do.

Open this file as root user and write below line in the file. This should be done for all the users one by one or if a machine is having a a lot of users, then you have to write a shell script for this. There is no difference between these two, both indicates one and the same.