shell - How to select a particular column in linux df command

Question

I am trying to collect information on the amount of space left on different servers. So when I execute df -k i get output as:

Filesystem  1024-blocks    Used     Avail Capacity  Mounted on
/dev/ad1s1f   125925198 2568970 113282214     2%    /builds

And sometimes the output comes as :

Filesystem           1K-blocks      Used Available Use% Mounted on
10.102.1.123:/storage/disk1/build
                     10735331328 10597534720 137796608  99% /buildbackup

Now I want to fetch data on the disk space available. So let me know how to fetch data from a particular column.

Answer 1

You can for example say:

df --output=source,avail

Or as commented by Tim Bunce, you can use --direct to prevent the long filesystem name make the line split in two. This will show the filesystem as -.

From man df:

--output[=FIELD_LIST]

use the output format defined by FIELD_LIST, or print all fields if FIELD_LIST is omitted.

...

FIELD_LIST is a comma-separated list of columns to be included. Valid field names are: 'source', 'fstype', 'itotal', 'iused', 'iavail', 'ipcent', 'size', 'used', 'avail', 'pcent' and 'target' (see info page).

--direct

show statistics for a file instead of mount point

Test

$ df --output=source,avail
Filesystem               Avail
/dev/sda7            321675536