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Linux FileSystem

1 - Linux file system

sriram@sriram-Inspiron-5567:~$ sudo fdisk -l /dev/sda
Disk /dev/sda: 111,8 GiB, 120034123776 bytes, 234441648 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 833807FE-A7E1-46DA-B629-ECC1B32A087E

Device         Start       End   Sectors   Size Type
/dev/sda1       2048   1050623   1048576   512M EFI System
/dev/sda2    1050624 217874431 216823808 103,4G Linux filesystem
/dev/sda3  217874432 234440703  16566272   7,9G Linux swap

Linux File Permissions

-rwsrwsrwt
chmod u+s,g+s,o+t dir

  • Sticky bit
    Items in directory may only be deleted by owner.
[root@10 ~]# ls -ld /tmp
drwxrwxrwt. 8 root root 216 Oct 27 11:18 /tmp

  • SGID - Set Group Identity
    Can be set on directories aswell as on files Directory : New objects in this directory inherit its group ownership.
    Execuable File : Runs as owning group rather than invoker’s group.

  • SUID - Set User Identity
    Executable: Program runs as owner, rather than caller.

SpecialPermissions

References

Linux file system
man hier