How many owners can a file have in Linux?
Every Linux system have three types of owner: User: A user is the one who created the file. By default, whosoever, creates the file becomes the owner of the file….Following are the file types:
| First Character | File Type |
|---|---|
| l | Symbolic link |
| p | Named pipe |
| b | Blocked device |
| c | Character device |
What is the difference between a primary group and a secondary group in Linux?
The two types of groups that a user can belong to are as follows: Primary group – Specifies a group that the operating system assigns to files that are created by the user. Secondary groups – Specifies one or more groups to which a user also belongs. Users can belong to up to 15 secondary groups.
How to give different groups different permissions on Linux?
By default, Linux’s permission system does not allow for this. The reason is simple: for each inode there are only three bits ( rwx) that describe permissions for a particular group, namely the group that owns the file/directory referred to by that inode.
Is it possible to have multiple Linux groups?
It is not possible to have a file owned by multiple Linux groups with traditional Unix permissions. (However, it is possible with ACL.) But you might use the following workaround and create a new group (e.g. called devFirms) which will include all users of the groups devFirmA, devFirmB and devFirmC. You create new user groups with:
Can a directory be owned by multiple groups?
If you also want files created in that directory to be owned by multiple groups, set the ACL as the default ACL. The X in the default group entry means “allow execution if executable by the owner (or anyone else)”. It is not possible to have a file owned by multiple Linux groups with traditional Unix permissions.
Why are there only three bits in Linux permission system?
By default, Linux’s permission system does not allow for this. The reason is simple: for each inode there are only three bits ( rwx) that describe permissions for a particular group, namely the group that owns the file/directory referred to by that inode. Any user who is not the owner nor belongs to that group automatically falls under others.