What is sticky bit SUID and SGID?

Asked by Michael Congleton on September 07, 2021

Categories: Technology and computing Operating systems

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Understanding special permissions using SUID, SGID and sticky bit. SUID means set user ID and SGID means set group ID. SUID have a value of 4 or useu+s. SGID has value of 2 or use g+s similarly sticky bit has a value of 1 or use +t to apply the value.

What is the difference between SUID and SGID? – SGID permission is similar to the SUID permission, only difference is – when the script or command with SGID on is run, it runs as if it werea member of the same group in which the file is a member. – The setgid permission displays as an “s” in the group's execute field.

How do you read permissions in Linux? User, Group and Other. Linux divides the file permissions into read, write and execute denoted by r,w, and x. The permissions on a file can be changed by 'chmod' command which can be further divided into Absolute andSymbolic mode. The 'chown' command can change the ownership of a file/directory.

What do you mean by sticky bit in Unix? In Unix-like operating systems, a sticky bit is a permission bit which is set on a file or folder, thereby permitting only the owner or root user of the file or folder to modify, rename or delete the concerned directory orfile. No other user would be permitted to have these privileges on a file which has a sticky bit.