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When I run df -h I see:

/dev/sda2                     46G  3.2G   41G   8% /
udev                          24G  4.0K   24G   1% /dev
tmpfs                        9.5G   10M  9.5G   1% /run
none                         5.0M     0  5.0M   0% /run/lock
none                          24G     0   24G   0% /run/shm
/dev/mapper/DG9999-lvDG9999   82T   75T  7.5T  91% /DG9999
/dev/sda3                     20G  445M   19G   3% /home
clamfs                        82T   75T  7.5T  91% /DG9999/clamfs

I'm using this command:

 df -h / | grep -v Filesystem | awk '{print $5}' | sed 's/%//g'

At the moment the output shows me the 5th column in the first line of the df -h output which is 8. How can I specify that I am interested in the 6th line of the output so that the output shows 91.

Thanks

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  • The problem is that you run df -h and then try to parse df -h / (which restricts it to the filesystem hosting '/') Commented Apr 18, 2017 at 15:42

1 Answer 1

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4

You need to specify the appropriate file system (or mount point):

df -h /DG9999 | grep -v Filesystem | awk '{print $5}' | sed 's/%//g'

When parsing df’s output on most Linux systems, you should use the -P option to ensure that each file system’s information is kept on a single line:

df -hP /DG9999 | grep -v Filesystem | awk '{print $5}' | sed 's/%//g'

You can combine all the output manipulation to use just AWK:

df -hP /DG9999 | awk '!/Filesystem/ { print substr($5, 1, length($5) - 1) }'

On any recent GNU setup you can also run

df --output=pcent /DG9999 | sed '1d;s/%//'
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  • @don_crissti I like the use of --output, thanks! Commented Apr 18, 2017 at 15:40
  • no prob; it's pretty cool, yeah... I missed the fact that OP wants only the number - in that case piping to tr -dc '[^[:digit:]]' instead of sed would be infinitesimally faster/more efficient as it doesn't require a regex :P Commented Apr 18, 2017 at 15:47

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