Bash Script and Math

Bash only does integer arithmetic, for floating point use bc -

whatislefta=`echo "200/20000"|bc -l`

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You can only do integer maths in bash.

whatislefta=$(echo 'scale=2;200/2000'|bc)

To control floating points, you can use the printf, that is derived from C -

printf "%.3f\n" $whatislefta

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What would you wish to do with a .01 result?

OK this seems to work but down the script I have some if statements and it throws an error it says  " line 95: [: .01: integer expression expected"

Here is the if statement.  $warn is an integer.

   if [ $whatislefta -gt $warn ]
   then
      ex=0
      condition="OK"

instead of
if [ $((200/20000)) -gt $warn ]
you can do
if [ 200 -gt $(($warn*20000)) ]

I have work out over the next 2 days so I may not be able to look at this until Friday.

Thanks I will let you know as soon as I have time to look at this again.