[olug] iso image

Jazz Lover jzlvr at home.com
Wed Nov 7 12:57:01 UTC 2001


I see.

Thanks.

Daryl




----- Original Message -----
From: "Brian Roberson" <roberson at bstc.net>
To: <olug at bstc.net>
Sent: Tuesday, November 06, 2001 10:43 PM
Subject: Re: [olug] iso image


> look at the key word here...  mount... `man mount` and search for the word
> "loop" or to save you the keystrokes....
>
> ####### `man 8 mount` #############
> # ( search for keyword "loop".... e.g. type this after you are looking at
> the man page: " /loop" and hit <enter> ( hopefully your $EDITOR is vi )
>
> THE LOOP DEVICE
>        One further possible type is a mount via the loop  device.
>        For example, the command
>
>          mount /tmp/fdimage /mnt -t msdos -o
loop=/dev/loop3,blocksize=1024
>
>        will  set  up  the loop device /dev/loop3 to correspond to
>        the file /tmp/fdimage, and then mount this device on /mnt.
>        This type of mount knows about three options, namely loop,
>        offset and encryption, that are  really  options  to  los­
>        etup(8).   If  no  explicit  loop device is mentioned (but
>        just an option `-o loop' is given), then mount will try to
>        find some unused loop device and use that.  If you are not
>        so  unwise  as  to  make  /etc/mtab  a  symbolic  link  to
>        /proc/mounts  then any loop device allocated by mount will
>        be freed by umount.  You can also free a  loop  device  by
>        hand, using `losetup -d', see losetup(8).
>
> ######### `man 8 losetup` ##########
>
> LOSETUP(8)             MAINTENANCE COMMANDS            LOSETUP(8)
>
>
> NAME
>        losetup - set up and control loop devices
>
> SYNOPSIS
>        losetup [ -e encryption ] [ -o offset ] loop_device file
>        losetup [ -d ] loop_device
>
> DESCRIPTION
>        losetup  is  used  to  associate loop devices with regular
>        files or block devices, to  detach  loop  devices  and  to
>        query the status of a loop device. If only the loop_device
>        argument is given, the status of  the  corresponding  loop
>        device is shown.
>
> OPTIONS
>        -d     detach the file or device associated with the spec­
>               ified loop device.
>
>        -e encryption
>               enable data encryption. The following keywords  are
>               recognized:
>
>               NONE   use no encryption (default).
>               XOR    use a simple XOR encryption.
>               Blowfish
>                      use Blowfish encryption. Blowfish encryption
>                      is only  available  if  you  are  using  the
> aux:~ # man losetup
>
>
>
> LOSETUP(8)             MAINTENANCE COMMANDS            LOSETUP(8)
>
>
> NAME
>        losetup - set up and control loop devices
>
> SYNOPSIS
>        losetup [ -e encryption ] [ -o offset ] loop_device file
>        losetup [ -d ] loop_device
>
> DESCRIPTION
>        losetup  is  used  to  associate loop devices with regular
>        files or block devices, to  detach  loop  devices  and  to
>        query the status of a loop device. If only the loop_device
>        argument is given, the status of  the  corresponding  loop
>        device is shown.
>
> OPTIONS
>        -d     detach the file or device associated with the spec­
>               ified loop device.
>
>        -e encryption
>               enable data encryption. The following keywords  are
>               recognized:
>
>               NONE   use no encryption (default).
>               XOR    use a simple XOR encryption.
>               Blowfish
>                      use Blowfish encryption. Blowfish encryption
>                      is only  available  if  you  are  using  the
>                      international kernel and Blowfish encryption
>                      has been enabled in the Crypto API.
>               Twofish
>                      use Twofish encryption.  Twofish  encryption
>                      is  only  available  if  you  are  using the
>                      international kernel and Twofish  encryption
>                      has been enabled in the Crypto API.
>               CAST   use CAST encryption. CAST encryption is only
>                      available if you are using the international
>                      kernel  and CAST encryption has been enabled
>                      in the Crypto API.
>               DES    use DES encryption. DES encryption  is  only
>                      available  if  the  optional DES package has
>                      been added to  the  kernel.  DES  encryption
>                      uses  an additional start value that is used
>                      to  protect  passwords  against   dictionary
>                      attacks. Use of DES is deprecated.
>               DFC    use  DFC  encryption. DFC encryption is only
>                      available if you are using the international
>                      kernel  and  DFC encryption has been enabled
>                      in the Crypto API.
>               IDEA   use IDEA encryption. IDEA encryption is only
>                      available if you are using the international
>                      kernel and IDEA encryption has been  enabled
>                      in the Crypto API.
>               MARS   use MARS encryption. MARS encryption is only
>                      available if you are using the international
>
>
>
> Linux                      Nov 24 1993                          1
>
>
>
>
>
> LOSETUP(8)             MAINTENANCE COMMANDS            LOSETUP(8)
>
>
>                      kernel  and MARS encryption has been enabled
>                      in the Crypto API.
>               RC5    use RC5 encryption. RC5 encryption  is  only
>                      available if you are using the international
>                      kernel and RC5 encryption has  been  enabled
>                      in the Crypto API.
>               RC6    use  RC6  encryption. RC6 encryption is only
>                      available if you are using the international
>                      kernel  and  RC6 encryption has been enabled
>                      in the Crypto API.
>               Serpent
>                      use Serpent encryption.  Serpent  encryption
>                      is  only  available  if  you  are  using the
>                      international kernel and Serpent  encryption
>                      has been enabled in the Crypto API.
>
>        -o offset
>               the data start is moved offset bytes into the spec­
>               ified file or device.
>
> RETURN VALUE
>        losetup returns 0 on success,  nonzero  on  failure.  When
>        losetup displays the status of a loop device, it returns 1
>        if the device is not configured and 2 if an error occurred
>        which prevented losetup from determining the status of the
>        device.
>
>
> FILES
>        /dev/loop0,/dev/loop1,...   loop devices (major=7)
>        /proc/cipher/*              available ciphers
>
> EXAMPLE
>        If you are using the loadable module  you  must  have  the
>        module loaded first with the command
>
>               # insmod loop.o
>
>        The  following commands can be used as an example of using
>        the loop device.
>
>               dd if=/dev/zero of=/file bs=1k count=100
>               losetup -e blowfish /dev/loop0 /file
>               Password :
>               mkfs -t ext2 /dev/loop0 100
>               mount -t ext2 /dev/loop0 /mnt
>                ...
>               umount /dev/loop0
>               losetup -d /dev/loop0
>
>        If you are using the loadable module you  may  remove  the
>        module with the command
>
>               # rmmod loop
>
>
>
> Linux                      Nov 24 1993                          2
>
>
>
>
>
> LOSETUP(8)             MAINTENANCE COMMANDS            LOSETUP(8)
>
>
> RESTRICTIONS
>        DES  encryption  is painfully slow. On the other hand, XOR
>        is terribly weak. Both are insecure nowadays. Some ciphers
>        require a licence for you to be allowed to use them.
>
> BUGS
>        CAST, DES, RC5 and Twofish are currently broken and cannot
>        be used.
>
> AUTHORS
>        Original version: Theodore Ts'o <tytso at athena.mit.edu>
>        Original DES by: Eric Young <eay at psych.psy.uq.oz.au>
>
>
>
> ----- Original Message -----
> From: "Jazz Lover" <jzlvr at home.com>
> To: <olug at bstc.net>
> Sent: Tuesday, November 06, 2001 9:30 PM
> Subject: Re: [olug] iso image
>
>
> > What is a loop device?
> >
> >
> >
>  > It is a byte image of a CDROM.  You can burn it to CD or MOUNT it with
a
> > loop device to get its contents.  Be careful to make the cd from the
image
>
>
>
> -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
>
> For help contact olug-help at bstc.net - run by ezmlm
> to unsubscribe, send mail to olug-unsubscribe at bstc.net
> or `mail olug-unsubscribe at bstc.net < /dev/null`
> (c)2001 OLUG http://www.olug.org
>
> -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
>


-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_

For help contact olug-help at bstc.net - run by ezmlm
to unsubscribe, send mail to olug-unsubscribe at bstc.net
or `mail olug-unsubscribe at bstc.net < /dev/null`
(c)2001 OLUG http://www.olug.org

-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_




More information about the OLUG mailing list