[CentOS-docs] LUKS create_encrypted_fs

Sat Sep 25 23:07:56 UTC 2010
Laszlo Fekete <blackluck at ktk.bme.hu>

Maybe the df manual can help you:

  -P, --portability     use the POSIX output format


On 09/26/2010 01:02 AM, Jim Angstadt wrote:
> Hi All,
>
> This is my first post to centos-docs.  I've read several months of
> archives, but, this may be too trivial.
>
> Re: http://wiki.centos.org/TipsAndTricks/EncryptedFilesystem/Scripts
>
> This line:
>
> FREE_SPACE=$(df -m $SECRET_PATH |grep / | awk '{ print $4 }')
>
> gave me a problem due to line wrapping in df.  For example:
>
> $ df -m /home/ja/verify/
> Filesystem           1M-blocks      Used Available Use% Mounted on
> /dev/mapper/VolGroup00-LogVol00
>                         589333    289168    269746  52% /
>
> So, $4 is 52% rather than 269746.
>
> The '/dev/mapper/VolGroup00-LogVol00' term is from a fresh install,
> so, perhaps others have this same name.
>
> This change worked for me:
> FREE_SPACE=$(${DF} -m ${PATH} | ${GREP} / \
> 			| ${TR} "\n" ' ' | ${TR} -s ' ' | ${CUT} -d' ' -f4)
>
> Note the reformating onto 1 line with TR.  The remainder could be what
> I have, the original awk statement, or whatever.  Thanks for your
> consideration.
>
> JIm
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>   

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