19

I made a directory called "shadi" and set this permission for it

sinoosh@ubuntu:/home$ ls -ld shadi
drwxr-xrwx 2 root root 4096 Jul  1 01:58 shadi

In this situation I have "others" permissions, but why can I not delete it?

sinoosh@ubuntu:/home$ rm -r shadi/
rm: cannot remove ‘shadi/’: Permission denied
30

Here the problem is you do not have "w" permission on the /home directory. While deleting a file note that you are not writing to that file but you are changing the contents of the directory that contains the file, so having "w" permission on the directory is a must if you want to delete any file from the directory.

terminal screenshot of "ls -ld /home"

If I am in a directory with "w" permission, I can delete any of its files without being worried about the file permission itself. Note that my present directory is /home/rohith which has "w" permission and hence I can delete any of its files irrespective of the file permissions.

terminal screenshot of removing /home/rohith/shadi

If the same file is created in the '/home' directory which has no "w" permission I get the same output as yours ! :)

terminal screenshot of trying to remove /home/shadi

| improve this answer | |
10

This happens because you don't own the directory, it is owned by 'root' and the 'root' group. So to delete it you can either changing the ownership and then delete it (here you elevate your rights and become 'root' for taking the ownership):

sudo chown $USER:$USER ./shadi
rm -r ./shadi

Or you skip taking the ownership and make a sudo rm to elevate your rights and become 'root' for the deletion:

sudo rm -r ./shadi
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  • it means just the owners can delete files? – Sinoosh Jul 1 '16 at 10:15
  • Yes, or you need to elevate your rights with the sudo command. this will ask for your password then and you become 'root' for the particular following command. – Videonauth Jul 1 '16 at 10:17
  • do you now if "shadi" was a file i can remove it with "sinoosh" user .it is not require "sudo " its not make scene for me why it does not work with directory – Sinoosh Jul 1 '16 at 11:02
6

Try this:

sudo rm -r ./shadi

The permissions show owner root and group root, so you have to use sudo.

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  • 1
    Yes this command is ok, but my problem is why rm is not working with this permissions i have full permissions for this directory in other field – Sinoosh Jul 1 '16 at 10:06
  • "i have full permissions for this directory" No you don't. "other field" shadi is not "others". – Rinzwind Jul 1 '16 at 10:23
  • but "sinoosh" is belongs to others and he execute "rm -r shadi" – Sinoosh Jul 1 '16 at 10:28
0

It's different accounts.

How would you expect safety from your account, if everyone had the permission to delete your home directory?

You do not have the w permission to delete someone other's home directory by default, except if they chmod +w it.

Here are the different permissions, and an example (-rwxr-x---/rwxrx):

+-+-+-+-+
|+|u|g|o|
+-+-+-+-+
|r|1|1|1|
+-+-+-+-+
|w|2|2|2|
+-+-+-+-+
|x|4|4|4|
+-+-+-+-+
|*|7|5|0|
+-+-+-+-+
It goes like this: 1 + 2 + 4 = 7, 1 + 4 = 5, 0 = 0, so 750, i.e. an ideal permission system. The owner (u in this case) can read, write and execute the file, the owner's group (g in this case) can read and execute, and anyone other (o in this case) cannot do anything. This is the legendary:
u: current user (User)
g: current user's groups (Groups)
o: not current user's groups (Others)
r: read permission (Read)
w: write permission (Write)
x: execute permission (X-ecute)
.

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