two question about linux

[vittorio]

1) using the "rm" command i can delete files and directory

but if i make a mistake, how can i undo the command to have my deleted files
back?
How about the same "undelete" dos command in linux?

2) i installed a little distro on an hold pc.

to install new packages it's necessary to insert the install disk, but with
this i can mount my hda2 partition without limitations because the diskette
use a root user without a password.
This mean that doing the boot from the inst diskette i can execute this
command:

mount /dev/hda2 /mnt -t ext2

and i can view the /root dir as "root" from /mnt/root

how can i forbid the "/" partition to whom is not the administrator of my
pc?

thank you!

[Bill Unruh]

"vittorio" <stortoaranci@libero.it> writes:

]1) using the "rm" command i can delete files and directory

]but if i make a mistake, how can i undo the command to have my deleted files
]back?
]How about the same "undelete" dos command in linux?

It does not exist. You cannot undo the command.
What you could do is to set up a alias, like

function rm () { cp $* /tmp; /bin/rm $* ;}
which will first copy your file to the tmp directory and then remove it.
( a better procedure might simply be to do
function rm () { mv $* /tmp ;}
)

However then there is the danger or completely filling /tmp with your
junk.


]2) i installed a little distro on an hold pc.

]to install new packages it's necessary to insert the install disk, but with
]this i can mount my hda2 partition without limitations because the diskette
]use a root user without a password.
]This mean that doing the boot from the inst diskette i can execute this
]command:

]mount /dev/hda2 /mnt -t ext2

]and i can view the /root dir as "root" from /mnt/root

]how can i forbid the "/" partition to whom is not the administrator of my
]pc?

You cannot. The / partition is crucial for everyone. They must be able
to see it, in order to do anything.
That is not true of /root. However if you allow anyone to put in a
rescue disk, then your machine is open. You could password protect the
booting in the bios with a bios password. But with physical access to
your system, that can also be overcome.
If someone has physical access to your system then that system is open
to them, unless you encrypt your drives.

[Alan Connor]

On Mon, 15 Sep 2003 20:54:43 GMT, vittorio <stortoaranci@libero.it> wrote:

>
>
> 1) using the "rm" command i can delete files and directory
>
> but if i make a mistake, how can i undo the command to have my deleted files
> back?
> How about the same "undelete" dos command in linux?
>

You can alias rm to rm -i, and then it will prompt you before completion.


You can create a "trashbin" where files are sent instead of being deleted.

create a directory called .tb and put this in your .bashrc

tb ()

{
mv "$@" ~/.tb ;

}

then add

alias rm='tb'

and enter

$ source .bashrc

> 2) i installed a little distro on an hold pc.
>
> to install new packages it's necessary to insert the install disk, but with
> this i can mount my hda2 partition without limitations because the diskette
> use a root user without a password.
> This mean that doing the boot from the inst diskette i can execute this
> command:
>
> mount /dev/hda2 /mnt -t ext2
>
> and i can view the /root dir as "root" from /mnt/root
>
> how can i forbid the "/" partition to whom is not the administrator of my
> pc?
>
> thank you!
>
>

Don't know,


AC


--

take control of your mailbox ----- elrav1 ----- [url]http://tinyurl.com/l55a[/url]
spammers hate this program because they can't beat it

[Lew Pitcher]

vittorio wrote:

> 1) using the "rm" command i can delete files and directory
>
> but if i make a mistake, how can i undo the command to have my deleted files
> back?

Restore the file from your last backup.
Otherwise, you've just lost the file.

> How about the same "undelete" dos command in linux?

Nope.

> 2) i installed a little distro on an hold pc.
>
> to install new packages it's necessary to insert the install disk, but with
> this i can mount my hda2 partition without limitations because the diskette
> use a root user without a password.
> This mean that doing the boot from the inst diskette i can execute this
> command:
>
> mount /dev/hda2 /mnt -t ext2
>
> and i can view the /root dir as "root" from /mnt/root
>
> how can i forbid the "/" partition to whom is not the administrator of my
> pc?

Don't permit installations based on an install disk boot.
It's unnecessary, and (as you can see) a security risk.

--

Lew Pitcher, IT Consultant, Application Architecture
Enterprise Technology Solutions, TD Bank Financial Group

(Opinions expressed here are my own, not my employer's)

[Mauriat]

vittorio wrote:

> 1) using the "rm" command i can delete files and directory
>
> but if i make a mistake, how can i undo the command to have my deleted files
> back?
> How about the same "undelete" dos command in linux?
>

<snip>

Has anyone tried this?

'unrm'

[url]http://freshmeat.net/projects/unrm/?topic_id=866[/url]

--

Mauriat
----------------------------
Remove 'NOSPAM' to email me.

[vittorio]

>> Don't permit installations based on an install disk boot.

> It's unnecessary, and (as you can see) a security risk.

how can i do this?

let me know if there is some mini/how-to about this thank's

[Lew Pitcher]

vittorio wrote:

>>>Don't permit installations based on an install disk boot.

>>
>>It's unnecessary, and (as you can see) a security risk.

>
>
> how can i do this?

Either physically or logically.

The "logical" approach would be to disable the "boot from floppy" in your BIOS
(perhaps by setting "BOOT ORDER C:,A:")

The "physical" approach would be to disable or remove the floppy disk drive.

In either case, you have to remove the physical capability of someone booting
off a floppy or other unauthorized media.


--
Lew Pitcher

Master Codewright and JOAT-in-training
Registered Linux User #112576 ([url]http://counter.li.org/[/url])
Slackware - Because I know what I'm doing.

[Nico Kadel-Garcia]

Lew Pitcher wrote:

> vittorio wrote:
>

>>>> Don't permit installations based on an install disk boot.
>>>
>>>
>>> It's unnecessary, and (as you can see) a security risk.

>>
>>
>>
>> how can i do this?

>
>
> Either physically or logically.
>
> The "logical" approach would be to disable the "boot from floppy" in
> your BIOS (perhaps by setting "BOOT ORDER C:,A:")

Logical can often be beaten by interrupting the reboot to fail 3 times
in a row, which on many mothereboards resets the BIOS to its default
values. Its a *nasty* trick, and a good reason to avoid reprogramming
your BIOS to get cutesy behaviors.