Three types of permission read write and execute, Ever file and folder have three relations owner group and

others

[ Read = r write = w execute = x ] [ owner = u group = g other = o ]

[root@pc1 ~] # Ls -Ld /disk

1= nature of object [d=dir -=file L=link]

2= first three permission for owner [ rwx ]

3= second three permission for group members [ r-x]

4= third three permission for others [r-x]

5= number of inodes contain by this directory

6= owner of directory

7= group of directory

8= size of directory

9= creating date of object

10= name of object

[root@pc1 ~] # Ls -L /disk

Drwxr-xr – x 2 root root 4096 Jan 1 1988 dir1

Drwxr-xr – x 2 root root 4096 Jan 1 1988 dir2

Drwxr-xr – x 2 root root 4096 Jan 1 1988 dir3

Changing permission = give write permission to other on /disk

[root@pc1 ~] # chmod 0+w /disk

Give read write and execute permission for group on /disk

[root@pc1 ~] # chmod g+rwx /disk

Assigning read writ and execute permission to user, group and other with single command

[root@pc1 ~] # chmod u+rwx , g+rwx, o – rwx /disk

Assigning different permission with different commands which separate with semicolon

[root@pc1 ~] # chmod u+rwx /disk ; chmod g+rwx /disk ; chmod 0+rx /disk

Using number system =----- [ Read = 4 ] [ Write = 2 ] [ Execute = 1 ]

rwx=7

r-x=5

---=0

Assigning full permission to owner and no permission for group and others

[root@pc1 ~] # chmod 700 /disk

Assigning full permission for owner and group no permission for other

[root@pc1 ~] # chmod 700 /disk

Assigning full permission to all

[root@pc1 ~] # chmod 777 /disk

Assigning full permission for owner and read, and execute for group and others

[root@pc1 ~] # chmod 755 /disk

Assigning no permission for all

[root@pc1 ~] # chmod 000 /disk

Assigning sticky bit permission for other

[root@pc1 ~] # chmod o+t /disk

Assigning suid permission for owner

[root@pc1 ~] # chmod u+s /disk

Assigning sgid permission for group

[root@pc1 ~] # chmod g+s /disk