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Shell Programming and Scripting

Calculation returns no value

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# 1  
Old 07-21-2011
Calculation returns no value
HTML Code:
#/bin/sh
.....
#convert memory to MB
let "mmsize_a= ($mmsize)/256"
let "mminuse_a= ($mminuse)/256"
let "mmfree_a= ($mmsize_a -$mminuse_a)"
let "mmfreepercent= (($mmfree_a)/($mmsize_a))*100"
#
#format output
echo "\n\n######################" >>$sndFile
echo "\n$sysName Total Memory usage" >>$sndFile
echo "\nTotal Memory size: $mmsize_a MB" >>$sndFile
echo "\nTotal Memory inuse: $mminuse_a MB" >>$sndFile
echo "\nTotal Memory Free: $mmfree_a MB" >>$sndFile
echo "\nTotal Memory Free %: $mmfreepercent %" >>$sndFile
The other calculation works fine, but "mmfreepercent= (($mmfree_a)/($mmsize_a))*100" returns null (no value at all) on the echo echo "\nTotal Memory Free %: $mmfreepercent %".

Please advise.
# 2  
Old 07-21-2011
Remove the paranthesis and try. Or for better math calculation check here
Code:
let "mmfreepercent= ($mmfree_a/$mmsize_a)*100"

# 3  
Old 07-21-2011
Original sh not include builtin calculation. And posix shells include only integer.
ksh93 include floating numbers.
Code:
typeset -F2 c
typeset -F0 a b
a=4000
b=6000
((c=b/a*100))

If use only integers, then 1st *100 and then /mm_size.
Code:
mmfreepercent=$((mmfree_a*100/mmsize_a))

This User Gave Thanks to kshji For This Post:
Daniel Gate
# 4  
Old 07-21-2011
Thank you so much. That works fine!
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