Keeping floating aspect in a sum

[SwissKnife]

Hi,

Here my code, computing a sum like this:

   
    typeset -Z10 OCCUPANCY=0
    typeset -Z10 TOTALsize=0
    find /logiciel -name backup_logs -type d | while read folder
    do
        A=`du -ms $folder`
        OCCUPANCY=`echo $A | awk -F" " '{ print $1}'`
        echo "[$OCCUPANCY Mb] => $folder"
        (( TOTALsize=TOTALsize+OCCUPANCY ))
    done
    echo "[$TOTALsize Mb] => total size"
    

The output si something like this:

....
[0000000.64 Mb] => /logiciel/app/oracle/diag/rdbms/iotstd0/IOTSTD0/trace/cdmp_20170111084019/backup_logs
[0000000.65 Mb] => /logiciel/app/oracle/diag/rdbms/iotstd0/IOTSTD0/trace/cdmp_20170111094523/backup_logs
[0000000.65 Mb] => /logiciel/app/oracle/diag/rdbms/iotstd0/IOTSTD0/trace/cdmp_20170111104532/backup_logs
[0000000.64 Mb] => /logiciel/app/oracle/diag/rdbms/iotstd0/IOTSTD0/trace/cdmp_20170111131544/backup_logs
[0000000.06 Mb] => /logiciel/app/oracle/diag/rdbms/sianah00/SIANAH00/trace/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/diag/tnslsnr/AIXTEST3/listener/trace/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/product/11.2.0.3/dbhome_1/log/aixtest3/client/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/product/11.2.0.3/dbhome_1/network/log/backup_logs
[0000000.42 Mb] => /logiciel/app/oracle/product/11.2.0.3/dbhome_1/rdbms/audit/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/product/11.2.0.3/dbhome_1/rdbms/log/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/product/11.2.0.4/log/aixtest3/client/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/product/11.2.0.4/network/log/backup_logs
[0000001.18 Mb] => /logiciel/app/oracle/product/11.2.0.4/rdbms/audit/backup_logs
[0000000.00 Mb] => /logiciel/app/oracle/product/12.1.0/dbhome_1/network/log/backup_logs
[0000000.79 Mb] => /logiciel/app/oracle/product/12.1.0/dbhome_1/rdbms/audit/backup_logs
[0000000.04 Mb] => /logiciel/app/oracle/product/12.1.0/dbhome_1/rdbms/log/backup_logs

[0000000017 Mb] => total size

How to keep decimal aspect for the sum ?

Any ideas ?

Kind regards,

Den.  

[Steven Schweda · Accepted solution]

   I don't do arithmetic with fractions in a shell, so I know nothing,
but ...

   As I read the "man" pages, "typeset -Z" sets a field width, but says
nothing about what follows a decimal point, or even whether you have a
decimal point.  For example:

mba$ (( x = 2.50 + 3.50 ))
mba$ echo $x
6

   That is, "6", not "6.0", or "6.00", or "6.0000", or ...

   Adding "typeset -Z" does little to change this:

mba$ typeset -Z10 a
mba$ (( a = 2.50 + 3.50 ))
mba$ echo $a
0000000006

   If you want to format output, then "printf" may be closer to what you
want:

mba$ y=` printf '%010.2f' $x `
mba$ echo $y
0000006.00

No need for "typeset" this way.  Less ugly, but still aligned:

mba$ y=` printf '%10.2f' $x `
mba$ echo "$y"  
      6.00

[Dennis Handly]

You can either do all the work in your awk program, including the sums.

Or you can do what COBOL does, use scaled arithmetic.  Which means you multiply your inputs by a power of 10 and when printing you do a divide and remainder to get the fractional parts.

[SwissKnife]

Hi,

I finally used comething like this

    OCCUPANCY=$(echo "$B -$A" | bc)

Thanks folks for your help,

Kind regards, 

Den.