problem with chmod

Amedee Van Gasse (ubuntu) amedee-ubuntu at amedee.be
Tue Apr 28 23:19:48 UTC 2009


Ray Parrish schreef:
> habtool wrote:
>> On Sat, 2009-04-04 at 15:41 -0700, Ray Parrish wrote:
>>   
>>> Bret Busby wrote:
>>>     
>>>> As it happens, it does work on the system.
>>>>
>>>> As stated in another response to my messages, the command does require 
>>>> to be done with sudo. I tried that, and that works.
>>>>
>>>> :~$ cat /etc/fstab
>>>> # /etc/fstab: static file system information.
>>>> #
>>>> # <file system> <mount point>   <type>  <options>       <dump>  <pass>
>>>> proc            /proc           proc    defaults        0       0
>>>> # /dev/sda8
>>>> UUID=3bb93d1c-1875-4036-90c7-846e954ceb45 /data         ext3    defaults        0       0
>>>> # /dev/sda5
>>>> UUID=cb771616-3630-4139-9b1d-c3fb499d9949 /debian_home  ext3    defaults        0       0
>>>> # /dev/sda7
>>>> UUID=1b72f837-17e1-4af9-9f22-31dc9a191657 /               ext3    relatime,errors=remount-ro 0       1
>>>> # /dev/sda6
>>>> UUID=b421ce00-c5cc-4df1-9102-65b0b256376d none            swap    sw              0       0
>>>> /dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0       0
>>>> /dev/scd1       /media/cdrom1   udf,iso9660 user,noauto,exec,utf8 0       0
>>>> /dev/fd0        /media/floppy0  auto    rw,user,noauto,exec,utf8 0       0
>>>>
*snip*
>>> Hello,
>>>
>>> I think I see your problem... correct me if I'm wrong someone, but 
>>> aren't most of the lines he wants to mount commented out in his fstab? I 
>>> checked my fstab file, and none of the lines in it, have a hash mark at 
>>> the beginning of them, and the hash mark is often used to turn a line 
>>> into a comment which gets ignored in configuration files.
>>>
>>> In your fstab file, sda5, 6, 7, & 8 are all commented out with a hash 
>>> mark. [#] Remove those hash marks, and I believe your problem will go 
>>> away. 8-)
>>>
>>> Later, Ray Parrish
>>>
*snip*
>>>
>>>
>>>     
>> Ray
>>
>> I think the hashes are fine in this instance, as they are only blanking
>> the reference to the partition in the sda format, that would have been
>> used before they switched to uuid.
>> I.E the UUID is now used in the line below the # /dev/sda8 etc
>>
>> Hope this makes sense
>>
>> later
>> Habtool
>>   
> Yes, I just took a closer look at my fstab file, and now I see that only 
> the drives not being identified with UUIDs are prefaced with the sdan 
> identifiers. My bad... Thanks for correcting me, I'm always ready to 
> learn. 8-) the only partition using a UUID to identify it on my system, 
> is the Ubuntu root/boot partition, and all of my NTFS partitions are 
> using the dev/sda method.
> 
> Later, Ray Parrish
> 

If you want to learn... ;-)

A third method of referencing drives/partitions is by label.
For example:

proc            /proc      proc    defaults        0       0
LABEL=ubuntu64  /          ext3    relatime,errors=remount-ro 0       1
LABEL=boot	/boot      ext2    noatime         0       0
LABEL=home      /home      ext3    relatime        0       2
LABEL=swap      none       swap    sw              0       0

You can add a label to a new partition with:
mkfs -t ext3 -L label /dev/sdb1

and to an existing partition with:
tune


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