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How to format the output of df -h?

 
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# 1  
Old 05-05-2014
Question How to format the output of df -h?
Hi,

I need to format the output of the command "df -h":
Code:
 
$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-lv01
271G 13G 245G 6% /
tmpfs 16G 0 16G 0% /dev/shm
/dev/sda1 97M 50M 43M 55% /boot
/dev/mapper/d1vg-lv01
124G 105G 13G 90% /d0

I used awk:
Code:
 
df -h | awk '{printf "%-35s %10s %6s %6s %4s %s\n",$1,$2,$3,$4,$5,$6}'
Filesystem Size Used Avail Use% Mounted
/dev/mapper/rootvg-lv01
271G 13G 245G 6% /
tmpfs 16G 0 16G 0% /dev/shm
/dev/sda1 97M 50M 43M 55% /boot
/dev/mapper/d1vg-lv01
124G 105G 13G 90% /d0

The lines with shorter filesystems, like "tmpfs, /dev/sda1" came out fine, but the longer filesystems, like "/dev/mapper/rootvg-lv01" above, somehow the size got put to the next line, making that line shifted. I've experimented with different column width and couldn't fix it. How do I get those columns all aligned?

thanks!

J.

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks
# 2  
Old 05-05-2014
Re-paste
Can you try to re-paste your results with CodeTags?
The example you provided did not appear to even block off 35 spaces for the first field.
# 3  
Old 05-05-2014
Code:
df -Ph

And then try your awk code
These 2 Users Gave Thanks to SriniShoo For This Post:
neutronscott seafan
# 4  
Old 05-05-2014
i think the problem is that df will wrap the output if the Filesystem is long.
Perhaps your df has an option to stop this. df -P seems to on Linux coreutils. or have awk join the lines:

Code:
df -h | awk '!$2{getline x;$0=$0 x}{printf "%-35s %10s %6s %6s %4s %s\n",$1,$2,$3,$4,$5,$6}'

This User Gave Thanks to neutronscott For This Post:
seafan
# 5  
Old 05-05-2014
Quote:
Originally Posted by SriniShoo
Code:
df -Ph

And then try your awk code
that worked! THANKS!

---------- Post updated at 01:15 PM ---------- Previous update was at 01:09 PM ----------

Quote:
Originally Posted by neutronscott
i think the problem is that df will wrap the output if the Filesystem is long.
Perhaps your df has an option to stop this. df -P seems to on Linux coreutils. or have awk join the lines:

Code:
df -h | awk '!$2{getline x;$0=$0 x}{printf "%-35s %10s %6s %6s %4s %s\n",$1,$2,$3,$4,$5,$6}'


That works too! I'm not well versed in awk, do you mind to explain how that "!$2{getline x;$0=$0 x}" part works?

---------- Post updated at 01:24 PM ---------- Previous update was at 01:15 PM ----------

a related question about sorting that result:

Code:
df -Ph | sort -k 5,5 | awk '{printf "%-35s %10s %6s %6s %4s %s\n",$1,$2,$3,$4,$5,$6}'
tmpfs                                      16G      0    16G   0% /dev/shm
/dev/sda1                                  97M    50M    43M  55% /boot
/dev/mapper/rootvg-lv01                   271G    13G   245G   6% /
/dev/mapper/d1vg-lv01                     124G   105G    13G  90% /d0
Filesystem                                Size   Used  Avail Use% Mounted

the goal is to sort it with % used, but it looks that "sort" would treat 55% less than 6%, comparing only the first digit?

also how to keep the header line on the top?
# 6  
Old 05-05-2014
a) If the file system is the only field on that particular line ($2 zero or empty), read and append the next line to $0.
b) use numeric sort (-n or -g option)
c) not possible with sort; need to resort to head and tail, or do it in awk.
# 7  
Old 05-06-2014
As was already mentioned !$2 tests for 0 or "", and should be better replaced by ($2!="") or (NF<2) .
I usually write an implicit if-clause in ( ).
 
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