The following xargs call is failing for me and I can't for the life of me figure out why...

```
param="pvr.ccz:--format cocos2d --disable-rotation --shape-padding 1 --border-padding 0 --opt PVRTC4 --auto-sd --texture-format pvr2ccz --pack-mode Best --size-constraints NPOT"

seq 10 | xargs -I@ -P ${numProcs[${gBuildConfig}]} -n 1 bash -c './generateBackgrounds.sh parallax-stage-@-atlas "*.png" "${param}" Parallax'

```

All I know is that the way I am quoting the ${param} variable is causing this to not work. My problem is I can't figure out what the quoting should be. Using the existing structure I have above when try to print out the value of ${param} inside of generateBackgrounds.sh I get nothing, just an empty string.