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All You Need to Know about Linux File Permission

Posted on November 10, 2012 by dvs007

Hope this will help you to understand different file permissions and  how to changes the permission of a file or directory in a UNIX/LINUX system.
Syntax;
chmod [numeric combination] [filename]
here [numeric combination] is created using the following criteria.
Owner
(User who owns the file.)
Group
(Group that owns the file)
Anybody
(Other)
non 0 0 0
read 4 4 4
write 2 2 2
execute 1 1 1
if you want to make your file read only by owner, then use
chmod 400 filename
if only executed by others

chmod 001 filename

if read/write by the owner and only read by everyone else
chmod (4+2)(4)(4)  file
which is;

chmod 644 filename

With this if all need executable rights
chmod (4+2+1)(4+1)(4+1)  file
that’s it;

chmod 755 filename

This can also be calculated in a more professional way.

when we are checking the permissions of files using “ls -l” command in the terminal we get a results which looks like “– rwx r-x r– file “.

this can be interpreted as;
- rwx r-x r-- file 
--111 101 100
here;
    r  read
    w  write
    x executable
    - non
 


Where now when we convert each set binary digits to decimal,
Binary Decimal
000 0
001 1
010 2
011 3
Binary Decimal
100 4
101 5
110 6
111 7
We get the numeric values we wonted. In this case its 754
So we have to use the command.

chmod 754 file

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