Related to: FC4 Sluggishness on a 466 MHz Celeron

[Mike McCarty]

Ralf Corsepius wrote:

>On Wed, 2005-07-13 at 10:10 -0500, Mike McCarty wrote:
>  
>
>>Paul Howarth wrote:
>>    
>>
>>    
>>
>>>On Wed, 2005-07-13 at 01:46 -0500, Mike McCarty wrote:
>>>      
>>>
>
>  
>
>>>>I don't understand why echo should be able to write a file that
>>>>an editor cannot.
>>>>   
>>>>
>>>>        
>>>>
>>>Some editors like to rename the original file to "filename~" and then
>>>write out a new file "filename". This won't work in /proc.
>>>
>>>Paul.
>>> 
>>>
>>>      
>>>
>>I don't use *that* editor. I never have used that one. 
>>    
>>
>Are you sure? Many editors open files like this.
>
>  
>
Yes, I am sure. I built it from source myself, and am *very* familiar
with its behavior, having used it for over 10 years, and been the
maintainer of my copy of it over that period of time.

>>Interesting that one
>>can delete but not rename the file, even as owner. How is that accomplished?
>>    
>>
>
>It's ordinary permissions on files and directories:
>
># ls  -ld /proc/sys/vm/swappiness
>-rw-r--r--  1 root root 0 Jul 13 17:13 /proc/sys/vm/swappiness
># ls  -ld /proc/sys/vm
>dr-xr-xr-x  2 root root 0 Jul 13 17:13 /proc/sys/vm
>
>Note the owner permissions.
>  
>
Indeed. I should have thought of that. I often use sort of "lazy thinking"
about root privilege, and should have thought to look at the directory.

[chanting]

"'Root' does not mean 'can do everything',  'root' does not mean 'can do
everything', ..."

Mike

-- 
p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
This message made from 100% recycled bits.
I can explain it for you, but I can't understand it for you.
I speak only for myself, and I am unanimous in that!