linux:644, 755, 777 permissions

Source: Internet
Author: User

The first bit 7 equals 4+2+1,rwx, the owner has read, write, execute permission;

The second bit 5 equals 4+1+0,r-x, the same group of users have read, execute permissions but no write permission;

Third bit 5, ditto, is also r-x, other users have read, execute permissions but do not have write permission.

Common Linux file permissions are listed below:

444 r--r--r--
RW-------
644 rw-r--r--
666 rw-rw-rw-
RWX------
744 rwxr--r--
755 Rwxr-xr-x
777 Rwxrwxrwx

RWX permissions digital interpretation under Linux
Chmod can also use numbers to represent permissions such as chmod 777 file
The syntax is: chmod ABC file
Each of the a,b,c is a number that represents the permissions of the user, Group, and other respectively.
R=4,w=2,x=1
To rwx the attribute then 4+2+1=7;
To rw-the attribute then 4+2=6;
To r-x the property, 4+1=7.
Example:
chmod a=rwx File
And
chmod 777 File
Same effect
chmod ug=rwx,o=x File
And
chmod 771 File
Same effect
Use chmod 4755 filename to give this program root privileges

Summary: Permissions total 10 bits from the second position each of the three groups R W x 4 2 1 have the plus

linux:644, 755, 777 permissions

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.