what is sticky bit and sgid?

Question

Accepted Answer

Sticky bit and SGID are special permissions in Linux file system.

Sticky bit is denoted by 't' in file permission and restricts deletion of files in a directory by non-owners.
SGID is denoted by 's' in file permission and sets the group ID of newly created files to the group of the parent directory.
SGID can also be used on executable files to allow users to run them with the permissions of the group that owns the file.
SGID can be set on directories to ensure that newly created files inherit the group ownership of the parent directory.
Sticky bit is commonly used on directories like /tmp to prevent unauthorized deletion of files by other users.
SGID is commonly used on directories like /var/www to ensure that newly created files have the correct group ownership for web server access.

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