Combinations of x, y and z coordinates (stored in three different files)

I am writing a bash script for automatising blind docking (finding binding sites within a protein). For so doing, I have divided a big 3D grid in smaller overlapping grids.

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I have created three files containing the x, y and z coordinates of the sub-grids centres, respectively. In other words, one file contains all the possible x coordinates (one per line), the second all the y coordinates and the third all the z coordinates. The coordinates have three decimal places and can be positive or negative.

Now I would like to find all possible combinations of x,y and z. For each combination I would like to create a folder (called something like x1y1z1, x1y2z1, x1y3z1, etc) containing a text file with x, y and z coordinates that correspond to that particular combination.

I have found solutions to related problems using Python. However, as I am not familiar with Python and I have already a large bash script with a lot of variables defined, I would like to know if there is an easy way for doing this in bash or in any other language that I can easily integrate in my existing bash script.

Kind regards,

Miro

UPDATE:

This is the adapted version of the solution indicated by Matt D (thanks a million):

for x in $(cat centrex.tmp) ; do
 for y in $(cat centrey.tmp) ; do
  for z in $(cat centrez.tmp) ; do
      xvar=$(expr "$x" : '\(.*\)=.*')
      yvar=$(expr "$y" : '\(.*\)=.*')
      zvar=$(expr "$z" : '\(.*\)=.*')
      folder="${xvar}${yvar}${zvar}"
      mkdir $folder
      echo "center_x = "${x#*=} >> vinapar.conf
      echo "center_y = "${y#*=} >> vinapar.conf
      echo "center_z = "${z#*=} >> vinapar.conf
      cp vinapar.conf $folder/
      rm vinapar.conf
   done
 done
done

The reason to do this is that finally I formated my centreX.tmp files in this way:

x00=-15.349
x01=-10.349
x02=-5.349
...

This allows me to name the folders according to the chunk before the equals sign (x01y23z09) and then create files containing the actual coordinates.

---

If you want all the combinations of the contents, this will be a triple-nested loop.

#!/bin/bash
for x in $(cat xfile) ; do
  for y in $(cat yfile) ; do
    for z in $(cat zfile) ; do
      filename="$x$y$z"
      mkdir $filename
      # makes a file called xyz in dir xyz with contents "xyz"
      echo $filename > $filename/$filename 
    done
  done
done

Edit: This form would use read (haven't tested)

#!/bin/bash
while read x ; do
  while read y ; do
    while read z ; do
      filename="$x$y$z"
      mkdir $filename
      # makes a file called xyz in dir xyz with contents "xyz"
      echo $filename > $filename/$filename 
    done < zfile
  done < yfile
done < xfile