Suppose you have permission to write to a file but not to delete it - What rights do we talk about?
Clash Royale CLAN TAG#URR8PPP up vote
3
down vote
favorite
Suppose you have permission to write to a file but not to delete it.
What rights do we talk about?
Read and write rights?
permissions
add a comment |Â
up vote
3
down vote
favorite
Suppose you have permission to write to a file but not to delete it.
What rights do we talk about?
Read and write rights?
permissions
2
Not sure what you're talking about, but askubuntu.com/questions/240424/…
– muru
May 21 at 7:45
1
Reopen voters: I think it's clear what OP is asking but wording could be better. Judging from answer up-votes it's a good question but might be a duplicate as Muru alludes.
– WinEunuuchs2Unix
May 22 at 13:02
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
Suppose you have permission to write to a file but not to delete it.
What rights do we talk about?
Read and write rights?
permissions
Suppose you have permission to write to a file but not to delete it.
What rights do we talk about?
Read and write rights?
permissions
asked May 21 at 7:36
user831837
2
Not sure what you're talking about, but askubuntu.com/questions/240424/…
– muru
May 21 at 7:45
1
Reopen voters: I think it's clear what OP is asking but wording could be better. Judging from answer up-votes it's a good question but might be a duplicate as Muru alludes.
– WinEunuuchs2Unix
May 22 at 13:02
add a comment |Â
2
Not sure what you're talking about, but askubuntu.com/questions/240424/…
– muru
May 21 at 7:45
1
Reopen voters: I think it's clear what OP is asking but wording could be better. Judging from answer up-votes it's a good question but might be a duplicate as Muru alludes.
– WinEunuuchs2Unix
May 22 at 13:02
2
2
Not sure what you're talking about, but askubuntu.com/questions/240424/…
– muru
May 21 at 7:45
Not sure what you're talking about, but askubuntu.com/questions/240424/…
– muru
May 21 at 7:45
1
1
Reopen voters: I think it's clear what OP is asking but wording could be better. Judging from answer up-votes it's a good question but might be a duplicate as Muru alludes.
– WinEunuuchs2Unix
May 22 at 13:02
Reopen voters: I think it's clear what OP is asking but wording could be better. Judging from answer up-votes it's a good question but might be a duplicate as Muru alludes.
– WinEunuuchs2Unix
May 22 at 13:02
add a comment |Â
2 Answers
2
active
oldest
votes
up vote
14
down vote
accepted
To write to an existing file you need write permissions for that file.
To delete a file you need write permission for the folder that contains that file.
answered May 21 at 7:42
Florian Diesch
62.4k16156176
2
As an aside:rmasks first when one tries to delete a write protected file, even when the directory permissions are sufficient.
– Peter A. Schneider
May 21 at 13:47
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use:w!
– Zanna
May 22 at 14:42
add a comment |Â
up vote
4
down vote
Florian's answer is not quite complete on my system: I need both write and execute permission on the directory in order to delete a file in it.
Sample session:
I'm running a well-seasoned Debian with the ext4 file system. I create a directory with a file in it and then change the directory and file permissions before I try to delete the file.
File system ext4:
testuser@www:~$ df -T .
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda3 ext4 152326340 44429904 100196624 31% /
Let's create a directory and a file in it:
testuser@www:~$ mkdir d
testuser@www:~$ ls -ld d
drwxr-xr-x 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ echo kjhkjh > d/f
testuser@www:~$ ls -l d/f
-rw-r--r-- 1 testuser testuser 7 May 21 16:19 d/f
Expected: Cannot change file catalog without write permission on it:
testuser@www:~$ chmod 100 d && ls -ld d
d--x------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
Unexpected: Cannot change file catalog without execute permission on it:
testuser@www:~$ chmod 200 d && ls -ld d
d-w------- 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
I need both write and execute permission on it:
testuser@www:~$ chmod 300 d && ls -ld d
d-wx------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
As an aside: When the file (but not the directory) is write protected rm asks for permission before deleting. After all, deleting a file can be considered an extreme form of writing to it. There is no difference in lost data between echo -n "" > d/f and rm d/f in the common case that there is no other hardlink to the file.
testuser@www:~$ !echo
echo kjhkjh > d/f
testuser@www:~$ chmod 700 d && ls -ld d
drwx------ 2 testuser testuser 4096 May 21 16:21 d
testuser@www:~$ chmod 000 d/f && ls -l d/f
---------- 1 testuser testuser 7 May 21 16:21 d/f
testuser@www:~$ rm d/f
rm: remove write-protected regular file 'd/f'? y
testuser@www:~$ ls -l d
total 0
testuser@www:~$
answered May 21 at 14:40
Peter A. Schneider
1837
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
14
down vote
accepted
To write to an existing file you need write permissions for that file.
To delete a file you need write permission for the folder that contains that file.
answered May 21 at 7:42
Florian Diesch
62.4k16156176
2
As an aside:rmasks first when one tries to delete a write protected file, even when the directory permissions are sufficient.
– Peter A. Schneider
May 21 at 13:47
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use:w!
– Zanna
May 22 at 14:42
add a comment |Â
up vote
14
down vote
accepted
To write to an existing file you need write permissions for that file.
To delete a file you need write permission for the folder that contains that file.
answered May 21 at 7:42
Florian Diesch
62.4k16156176
2
As an aside:rmasks first when one tries to delete a write protected file, even when the directory permissions are sufficient.
– Peter A. Schneider
May 21 at 13:47
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use:w!
– Zanna
May 22 at 14:42
add a comment |Â
up vote
14
down vote
accepted
up vote
14
down vote
accepted
To write to an existing file you need write permissions for that file.
To delete a file you need write permission for the folder that contains that file.
answered May 21 at 7:42
Florian Diesch
62.4k16156176
To write to an existing file you need write permissions for that file.
To delete a file you need write permission for the folder that contains that file.
answered May 21 at 7:42
Florian Diesch
62.4k16156176
answered May 21 at 7:42
Florian Diesch
62.4k16156176
answered May 21 at 7:42
Florian Diesch
62.4k16156176
answered May 21 at 7:42
Florian Diesch
62.4k16156176
62.4k16156176
2
As an aside:rmasks first when one tries to delete a write protected file, even when the directory permissions are sufficient.
– Peter A. Schneider
May 21 at 13:47
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use:w!
– Zanna
May 22 at 14:42
add a comment |Â
2
As an aside:rmasks first when one tries to delete a write protected file, even when the directory permissions are sufficient.
– Peter A. Schneider
May 21 at 13:47
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use:w!
– Zanna
May 22 at 14:42
2
2
As an aside:
rm asks first when one tries to delete a write protected file, even when the directory permissions are sufficient.– Peter A. Schneider
May 21 at 13:47
As an aside:
rm asks first when one tries to delete a write protected file, even when the directory permissions are sufficient.– Peter A. Schneider
May 21 at 13:47
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use
:w!– Zanna
May 22 at 14:42
As another aside, you can force write to a file itself if you have write permission on the directory - for example in Vim you can use
:w!– Zanna
May 22 at 14:42
add a comment |Â
up vote
4
down vote
Florian's answer is not quite complete on my system: I need both write and execute permission on the directory in order to delete a file in it.
Sample session:
I'm running a well-seasoned Debian with the ext4 file system. I create a directory with a file in it and then change the directory and file permissions before I try to delete the file.
File system ext4:
testuser@www:~$ df -T .
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda3 ext4 152326340 44429904 100196624 31% /
Let's create a directory and a file in it:
testuser@www:~$ mkdir d
testuser@www:~$ ls -ld d
drwxr-xr-x 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ echo kjhkjh > d/f
testuser@www:~$ ls -l d/f
-rw-r--r-- 1 testuser testuser 7 May 21 16:19 d/f
Expected: Cannot change file catalog without write permission on it:
testuser@www:~$ chmod 100 d && ls -ld d
d--x------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
Unexpected: Cannot change file catalog without execute permission on it:
testuser@www:~$ chmod 200 d && ls -ld d
d-w------- 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
I need both write and execute permission on it:
testuser@www:~$ chmod 300 d && ls -ld d
d-wx------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
As an aside: When the file (but not the directory) is write protected rm asks for permission before deleting. After all, deleting a file can be considered an extreme form of writing to it. There is no difference in lost data between echo -n "" > d/f and rm d/f in the common case that there is no other hardlink to the file.
testuser@www:~$ !echo
echo kjhkjh > d/f
testuser@www:~$ chmod 700 d && ls -ld d
drwx------ 2 testuser testuser 4096 May 21 16:21 d
testuser@www:~$ chmod 000 d/f && ls -l d/f
---------- 1 testuser testuser 7 May 21 16:21 d/f
testuser@www:~$ rm d/f
rm: remove write-protected regular file 'd/f'? y
testuser@www:~$ ls -l d
total 0
testuser@www:~$
answered May 21 at 14:40
Peter A. Schneider
1837
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
add a comment |Â
up vote
4
down vote
Florian's answer is not quite complete on my system: I need both write and execute permission on the directory in order to delete a file in it.
Sample session:
I'm running a well-seasoned Debian with the ext4 file system. I create a directory with a file in it and then change the directory and file permissions before I try to delete the file.
File system ext4:
testuser@www:~$ df -T .
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda3 ext4 152326340 44429904 100196624 31% /
Let's create a directory and a file in it:
testuser@www:~$ mkdir d
testuser@www:~$ ls -ld d
drwxr-xr-x 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ echo kjhkjh > d/f
testuser@www:~$ ls -l d/f
-rw-r--r-- 1 testuser testuser 7 May 21 16:19 d/f
Expected: Cannot change file catalog without write permission on it:
testuser@www:~$ chmod 100 d && ls -ld d
d--x------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
Unexpected: Cannot change file catalog without execute permission on it:
testuser@www:~$ chmod 200 d && ls -ld d
d-w------- 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
I need both write and execute permission on it:
testuser@www:~$ chmod 300 d && ls -ld d
d-wx------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
As an aside: When the file (but not the directory) is write protected rm asks for permission before deleting. After all, deleting a file can be considered an extreme form of writing to it. There is no difference in lost data between echo -n "" > d/f and rm d/f in the common case that there is no other hardlink to the file.
testuser@www:~$ !echo
echo kjhkjh > d/f
testuser@www:~$ chmod 700 d && ls -ld d
drwx------ 2 testuser testuser 4096 May 21 16:21 d
testuser@www:~$ chmod 000 d/f && ls -l d/f
---------- 1 testuser testuser 7 May 21 16:21 d/f
testuser@www:~$ rm d/f
rm: remove write-protected regular file 'd/f'? y
testuser@www:~$ ls -l d
total 0
testuser@www:~$
answered May 21 at 14:40
Peter A. Schneider
1837
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
add a comment |Â
up vote
4
down vote
up vote
4
down vote
Florian's answer is not quite complete on my system: I need both write and execute permission on the directory in order to delete a file in it.
Sample session:
I'm running a well-seasoned Debian with the ext4 file system. I create a directory with a file in it and then change the directory and file permissions before I try to delete the file.
File system ext4:
testuser@www:~$ df -T .
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda3 ext4 152326340 44429904 100196624 31% /
Let's create a directory and a file in it:
testuser@www:~$ mkdir d
testuser@www:~$ ls -ld d
drwxr-xr-x 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ echo kjhkjh > d/f
testuser@www:~$ ls -l d/f
-rw-r--r-- 1 testuser testuser 7 May 21 16:19 d/f
Expected: Cannot change file catalog without write permission on it:
testuser@www:~$ chmod 100 d && ls -ld d
d--x------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
Unexpected: Cannot change file catalog without execute permission on it:
testuser@www:~$ chmod 200 d && ls -ld d
d-w------- 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
I need both write and execute permission on it:
testuser@www:~$ chmod 300 d && ls -ld d
d-wx------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
As an aside: When the file (but not the directory) is write protected rm asks for permission before deleting. After all, deleting a file can be considered an extreme form of writing to it. There is no difference in lost data between echo -n "" > d/f and rm d/f in the common case that there is no other hardlink to the file.
testuser@www:~$ !echo
echo kjhkjh > d/f
testuser@www:~$ chmod 700 d && ls -ld d
drwx------ 2 testuser testuser 4096 May 21 16:21 d
testuser@www:~$ chmod 000 d/f && ls -l d/f
---------- 1 testuser testuser 7 May 21 16:21 d/f
testuser@www:~$ rm d/f
rm: remove write-protected regular file 'd/f'? y
testuser@www:~$ ls -l d
total 0
testuser@www:~$
answered May 21 at 14:40
Peter A. Schneider
1837
Florian's answer is not quite complete on my system: I need both write and execute permission on the directory in order to delete a file in it.
Sample session:
I'm running a well-seasoned Debian with the ext4 file system. I create a directory with a file in it and then change the directory and file permissions before I try to delete the file.
File system ext4:
testuser@www:~$ df -T .
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sda3 ext4 152326340 44429904 100196624 31% /
Let's create a directory and a file in it:
testuser@www:~$ mkdir d
testuser@www:~$ ls -ld d
drwxr-xr-x 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ echo kjhkjh > d/f
testuser@www:~$ ls -l d/f
-rw-r--r-- 1 testuser testuser 7 May 21 16:19 d/f
Expected: Cannot change file catalog without write permission on it:
testuser@www:~$ chmod 100 d && ls -ld d
d--x------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
Unexpected: Cannot change file catalog without execute permission on it:
testuser@www:~$ chmod 200 d && ls -ld d
d-w------- 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
rm: cannot remove 'd/f': Permission denied
I need both write and execute permission on it:
testuser@www:~$ chmod 300 d && ls -ld d
d-wx------ 2 testuser testuser 4096 May 21 16:19 d
testuser@www:~$ rm d/f
As an aside: When the file (but not the directory) is write protected rm asks for permission before deleting. After all, deleting a file can be considered an extreme form of writing to it. There is no difference in lost data between echo -n "" > d/f and rm d/f in the common case that there is no other hardlink to the file.
testuser@www:~$ !echo
echo kjhkjh > d/f
testuser@www:~$ chmod 700 d && ls -ld d
drwx------ 2 testuser testuser 4096 May 21 16:21 d
testuser@www:~$ chmod 000 d/f && ls -l d/f
---------- 1 testuser testuser 7 May 21 16:21 d/f
testuser@www:~$ rm d/f
rm: remove write-protected regular file 'd/f'? y
testuser@www:~$ ls -l d
total 0
testuser@www:~$
answered May 21 at 14:40
Peter A. Schneider
1837
answered May 21 at 14:40
Peter A. Schneider
1837
answered May 21 at 14:40
Peter A. Schneider
1837
answered May 21 at 14:40
Peter A. Schneider
1837
1837
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
add a comment |Â
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
I think one always needs execute/traversal permission on a directory and all its parents to do anything with its content in addition to read or write permissions.
– David Foerster
May 22 at 19:19
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
@DavidFoerster Well, that's usually not mentioned; neither in the accepted answer here nor in most other places. And it was new to me. The execute bit on directories is rarely well explained (do you have a canonical documentation? I couldn't find any within the 2 minutes I gave it). I't also only medium logical, I find. It also seems redundant: What can I then do with just write but not execute permission?
– Peter A. Schneider
May 23 at 0:38
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
Nothing. In a way the traversal permission (i. e. the execute flag on directories) effectively affects the children and grand-children and not the directory with that permission itself. See askubuntu.com/q/862289/175814 and the links in its comments for further reading.
– David Foerster
May 23 at 10:08
add a comment |Â
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2
Not sure what you're talking about, but askubuntu.com/questions/240424/…
– muru
May 21 at 7:45
1
Reopen voters: I think it's clear what OP is asking but wording could be better. Judging from answer up-votes it's a good question but might be a duplicate as Muru alludes.
– WinEunuuchs2Unix
May 22 at 13:02