How to predict df resutls on different machines?!



Hello all,
Let's consider a scenario:

1) User is going to transfer   /usr/local  from Machine A onto Machine B.
2) Obviously, the first thing, would be comparing the size of data  on Machine A to available room on Machine B.
3) User runs  (on local):

# du  -s  /usr/local   in a scrip I have used          du -s  /usr/local | cut  f1

and also doing a query on remote machine using:

                           ssh  $REMOTE_MACHINE  df -k  .    |   awk '{ print $4 }'

then compare them BUT the problem is when I run the same command on a different machine such as Fedora instead of $4
I have to use $3 since $4 on Fedora brought up 56% which is a percentage of used room on remote machine.

Now, how can I predict which one should I use? this script will be used on different machines and has to work just fine.

Your feedback will be appreciated greatly.
Thanks


akohanAsked:
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ravenplConnect With a Mentor Commented:
> ssh  $REMOTE_MACHINE  df -k  .
You said that the above gives You different results on various OSes.
try df -kP # P stands for POSIX portable output format
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ravenplCommented:
df -kP /usr/local # should give portable results...
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akohanAuthor Commented:

Hello ravenpl,

Do you mean that I have to df instead of du ?! can you explain it in what them that command is useful?
room occupied by a directory? or available room on a media?


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akohanAuthor Commented:


Yes, it is working and thanks
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