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-         


        

Answer 1

fedorqui's solution is cleaner, but only works for df

A more general approach is to collapse multiple spaces to a single space using sed 's/ \+/ /g' or tr -s ' ', then use cut with spaces as delimiters: cut -d" " -f 4 So the command is:

df -k | tr -s ' ' | cut -d" " -f 4

Which results in something like this:

Available
26027952
854220
68376208

The same approach will work with other commands that output data to columns. For instance ls -l | tr -s ' ' | cut -d" " -f 6,7,8 will print the time columns from ls -l:

Dec 30 17:46
Mar 1 15:33
Mar 1 14:58
Mar 2 00:00
Jan 5 14:20
Mar 1 15:33
Feb 26 11:57
Feb 4 11:11
Mar 1 14:57