mount and umount

[Asheville Joe]

Thanks.  df did the trick!   It was unmounted, but /mnt/portable still 
"worked" because it was just a regular directory on /dev/hda somewhere.  
John Seth's post cleared up my misunderstanding and you provided the fix.

Joe

Cyber Source wrote:

> "df" will show you what is mounted. "df -lh" will give more info in 
> summary. My guess would be you were not unmounted because you 
> unmounted /dev/hdb1 and not /mnt/portable. Remember too that you 
> cannot be in the dir when trying to unmount it either.
> On Sun, 2003-09-21 at 17:42, Asheville Joe wrote:
>
>>/I have a removeable ide hard disk as hdb1.  I want to write a script to
>>access it for backup (a copy of my fstab is included below.  I wanted to 
>>test if it was mounted, and, if not, mount it.  To try it out, I went 
>>into an Xterm.
>>I su'd and mounted it -
>>mount /dev/hdb1 /mount/portable.  I  did a cd /mnt/portable and wrote a
>>small junk file to it and that worked.  So far so good.  Then, I did a
>>cd .. and umount /dev/hdb1.
>>I tried that again and it told it was not mounted (as expected).  BUT, I
>>then did an ls /mnt/portable and it still worked!  I even copied another
>>small junk file to it (although I had to su for it to work, which I 
>>don't understand).
>>
>>I thought that when I unmounted the device, trying to access, let alone
>>write to /mnt/portable would fail and generate an error.  It didn't!
>>
>>What don't I understand (about this in particular :) )?
>>
>>How do you test to see if a device is mounted (or accessible?) ?
>>
>>Joe
>>
>>/etc/fstab:
>>
>>/dev/hda7 / ext3 defaults 1 1
>>/dev/hda6 /boot ext2 defaults 1 2
>>none /dev/pts devpts mode=0620 0 0
>>/dev/hda9 /home ext3 defaults 1 2
>>none /mnt/cdrom supermount
>>dev=/dev/scd0,fs=auto,ro,--,iocharset=iso8859-1,codepage=850,umask=0 0 0
>>/dev/hda1 /mnt/dos_hda1 vfat
>>iocharset=iso8859-1,codepage=850,umask=0,defaults 0 0
>>/dev/hda5 /mnt/dos_hda5 vfat
>>iocharset=iso8859-1,codepage=850,umask=0,defaults 0 0
>>none /mnt/floppy supermount
>>dev=/dev/fd0,fs=auto,--,iocharset=iso8859-1,sync,codepage=850,umask=0 0 0
>>/dev/hdb1 /mnt/portable ext3 rw,user,noauto,exec,suid 0 0
>>none /proc proc defaults 0 0
>>/dev/hda8 swap swap defaults 0 0
>>----------------------------------
>>"I can assure you the flying saucers, given that they exist, are not
>>constructed by any power on earth." --Harry S. Truman; White House Press
>>Conference, Washington DC, April 4, 1950.
>>
>>/
>>
> -- Cyber Source <peter at thecybersource.com 
> <mailto:peter at thecybersource.com>>
>
>
>  
>

-- 

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"All great masters are chiefly distinguished by the power of adding a second, a third, and perhaps a fourth step in a continuous line. Many a man had taken the first step. With every additional step you enhance immensely the value of your first." --Ralph Waldo Emerson (1803-1882) US philosopher, poet, essayist