Learned denizens
$POE runs a system which is extensively Linux, and part of the system
is a small script which monitors the free space various devices using
some third party software.
The software isn't the issue - doing the math to work out the
percentage free is.
We're inth e middle of installing a new system, and where the old
system had disk space measured in gigabytes, this one returns values
in terabytes - and therein lies the problem.
The results from the third party software query are assigned as
variables in the script and converted into round numbers as below
free='/<external process>'
total='<external process>'
free_var=$(free%.*);
total_var=$(total%.*);
per=$(($free_var*100/$total_var));
The "per" figure is the one I'm interested in - percentage free space.
Now, with the system which returns gigabytes, this gives a good enough
result from the first two variables to get close enough for the people
who are managing the system, vis-a-vis
web4:~ # echo $free
25.40G
web4:~ # echo $total
61.14G
web4:~ #
Which gives a good enough result of 40% free.
With the NEW system, the results are somewhat different
web4:~ # echo $free
2.47T
web4:~ # echo $total
2.70T
web4:~ # echo $free_var
2
web4:~ # echo $total_var
2
web4:~ # echo $per
100
web4:~ #
Which gives a figure of 100% free - not a good thing.
So, after this long and involved description, my question for those
with much greater nouse than myself is - is there any way to take
these operations
free_var=${free%.*};
total_var=${total%.*};
so it returns 2.4 and 2.7 respectively instead of 2 and 2?
Note that I didn't write the original script, so please, no comments
of 'You should have done this" or "This way is better' - I'm not in a
position to make wholesale changes to the script concerned to make it
"better". I'm not modifying it at the moment - simply copying bits
from the script and pasting them into another terminal window to get
the output without changing the script itself.
Any advice regarding changing the math appreciated.
Thanks.
DaZZa
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