GNU bug report logs - #6511
df output difficult to parse

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Valerio Pachera <sirio81 <at> gmail.com>
To: submit <at> debbugs.gnu.org
Subject: df output difficult to parse
Date: Fri, 25 Jun 2010 17:43:22 +0200

Package: GNU coreutils
Version: 8.5

Severity: wishlist

Description:
I'm trying to parse di output of df command to check how much free
space is left on my disks.
I need to check this by a script.
The problem is that, when the device name is long, we get a new line
in the output (see example below).
It's difficult then have data relate with the device name or mount
poiunt usign grep and awk.

Proposed Solution:
simply add an option to not wrap the output text.

File system           Dim. Usati Disp. Uso% Montato su
/dev/mapper/VolGroup00-testing
                      9,2G  3,3G  5,5G  38% /
tmpfs                 1,5G     0  1,5G   0% /lib/init/rw
udev                   10M  224K  9,8M   3% /dev
tmpfs                 1,5G   12K  1,5G   1% /dev/shm
/dev/mapper/VolGroup00-dati
                      120G   77G   38G  68% /mnt/dati
/dev/mapper/VolGroup00-opt
                      5,0G  963M  3,8G  21% /opt
/dev/mapper/VolGroup00-var
                      5,0G  974M  3,8G  21% /var
fileserver:/pubblica  1,4T  579G  722G  45% /media/pubblica
proxy:/mnt/dati/ftp   9,8G  7,3G  2,0G  79% /media/ftp
/dev/sdb1             977M  852M  125M  88% /media/VALERIO


###### trying to extract used % ######

$ df -h /dev/mapper/VolGroup00-dati  | awk '{print $4}'
Usati

68%


$ df -h /dev/sdb1 | awk '{print $4}' | tr -d %
Usati
125M


Ad you can see, the colum 4 is not the same (used% in the first case,
Total space in the second).

Thank you

Message #8 received at 6511 <at> debbugs.gnu.org (full text, mbox):

From: Bob Proulx <bob <at> proulx.com>
To: Valerio Pachera <sirio81 <at> gmail.com>
Cc: 6511 <at> debbugs.gnu.org
Subject: Re: bug#6511: df output difficult to parse
Date: Fri, 25 Jun 2010 15:09:56 -0600

Valerio Pachera wrote:
> I'm trying to parse di output of df command to check how much free
> space is left on my disks.  I need to check this by a script.  The
> problem is that, when the device name is long, we get a new line in
> the output (see example below).  It's difficult then have data
> relate with the device name or mount poiunt usign grep and awk.

Thank you for the report.  That is a nuisance!

> Proposed Solution:
> simply add an option to not wrap the output text.

Your request has been considered, found useful and a new option has
been added to df to enable this format.  Please use the -P option.
That will put all of the output on one line.

  $ df -Ph /dev/mapper/VolGroup00-dati  | awk '{print $4}'

       -P, --portability
              use the POSIX output format

Please find this option already installed on your system.  I am so
glad that we could so quickly add this option for you! :-)

Bob

Message #11 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Davide Brini <dave_br <at> gmx.com>
To: bug-coreutils <at> gnu.org
Cc: 6511 <at> debbugs.gnu.org
Subject: Re: bug#6511: df output difficult to parse
Date: Fri, 25 Jun 2010 22:13:45 +0100

On Friday 25 June 2010, Valerio Pachera wrote:

> Package: GNU coreutils
> Version: 8.5
> 
> Severity: wishlist
> 
> Description:
> I'm trying to parse di output of df command to check how much free
> space is left on my disks.
> I need to check this by a script.
> The problem is that, when the device name is long, we get a new line
> in the output (see example below).
> It's difficult then have data relate with the device name or mount
> poiunt usign grep and awk.
> 
> Proposed Solution:
> simply add an option to not wrap the output text.
> 
> File system           Dim. Usati Disp. Uso% Montato su
> /dev/mapper/VolGroup00-testing
>                       9,2G  3,3G  5,5G  38% /
> tmpfs                 1,5G     0  1,5G   0% /lib/init/rw
> udev                   10M  224K  9,8M   3% /dev
> tmpfs                 1,5G   12K  1,5G   1% /dev/shm
> /dev/mapper/VolGroup00-dati
>                       120G   77G   38G  68% /mnt/dati
> /dev/mapper/VolGroup00-opt
>                       5,0G  963M  3,8G  21% /opt
> /dev/mapper/VolGroup00-var
>                       5,0G  974M  3,8G  21% /var
> fileserver:/pubblica  1,4T  579G  722G  45% /media/pubblica
> proxy:/mnt/dati/ftp   9,8G  7,3G  2,0G  79% /media/ftp
> /dev/sdb1             977M  852M  125M  88% /media/VALERIO
> 
> 
> ###### trying to extract used % ######
> 
> $ df -h /dev/mapper/VolGroup00-dati  | awk '{print $4}'
> Usati
> 
> 68%
> 
> 
> $ df -h /dev/sdb1 | awk '{print $4}' | tr -d %
> Usati
> 125M
> 
> 
> Ad you can see, the colum 4 is not the same (used% in the first case,
> Total space in the second).

Have a look at the -P option.

-- 
D.

Message #19 received at 6511-done <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: 7157-done <at> debbugs.gnu.org, 6511-done <at> debbugs.gnu.org
Subject: df no longer wraps lines
Date: Thu, 24 Mar 2011 00:11:40 +0000

Since I've just changed df to no longer split
entries with long device names over two lines
(since it now aligns columns consistently),
I'm closing these.

cheers,
Pádraig

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