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Umask Calculator
Post Description: i need to calculate a umask value for my default linux permissions on my server. i dont want to have to be changing the permissions on each file everytime i create one
Tags: umask, calculator
This Post Was Posted On Apr 28, 2010 By Less #3430

Umask Calculator by Less

i need to calculate a umask value for my default linux permissions on my server. i dont want to have to be changing the permissions on each file everytime i create one. so by using the umask command will help me save alot of time and typing.

this is what i have learned so far

Umask Created Files Created Directories

Umask 	Created Files 		Created Directories
-------------------------------------------------------------
000 	666 (rw-rw-rw-) 	777 	(rwxrwxrwx)
002 	664 (rw-rw-r--) 	775 	(rwxrwxr-x)
022 	644 (rw-r--r--) 	755 	(rwxr-xr-x)
027 	640 (rw-r-----) 	750 	(rwxr-x---)
077 	600 (rw-------) 	700 	(rwx------)
277 	400 (r--------) 	500 	(r-x------)

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odity

#3994 1

the way i do it is like this:

for files: 664 you can find out the umask like this

666
-664
-------
002

May 23, 2010 Reply Report abuse

David

#9869

WRONG! the permissions resulting from a umask is calculated by performing a binary AND on 666 for files and 777 for directories. IE:

DEFAULT: 666 = 110|110|110
UMASK : 023 = 111|101|100 (umask = 023 = 000|010|011)
============ : 644 = 110|100|100

As you can see the results are similar to subtracting but not the same.

Jul 25, 2012 Report abuse

umask3.0

#3925 2

i have created a umask calculator script using javascript which you can run on your browser, if anyone is interested let me know. the file is only 30k long. so it very easy to upload. thanks you

May 04, 2010 Reply Report abuse