Using Floating Numbers in String

tintin72 · #1 (**permalink**) 06-29-2009

Dear Unix Gurus,

I have a list of files that I want to loop over....for example:

Code:

 
sl40_z11.70.txt
sl41_z11.40.txt
sl42_z11.10.txt
sl43_z10.80.txt

using the script

Code:

 
#!/bin/sh
#
echo -n "....enter first Z-coordinate position....."; read zpos
q="scale=3; $zpos"
p=0.3
#
loopNumber=$[($lastslice - $firstslice)+1]
echo "loopNumber is $loopNumber"
echo firstslice no. is $firstslice
 
for ((i=$firstslice; i<=$loopNumber; i++)); do 
n=$[i]
for ((k=0; k<=$loopNumber; k++)); do 
r=$[k] ; f=$r*$p ; zposition=$q-$f 
 
echo "sl$[n]_z$[zposition].txt"
 
done
done

where firstslice is 40 and lastslice is 43 and 0.3 is the difference in z-cordinate btw the files.

My problem is that the script works fine with the exception that bash doesn't recognize $zposition. It apparently can't handle iteration with floating numbers? Can someone help?

Cheers

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