I am generating a design matrix by running `feat_model run0` in a directory containing a run0.fsf file.
The feat_model call will fail if I use the following code in run0.fsf to specify the location of the FLOBS:
```
set fmri(default_bfcustom) "$FSLDIR/etc/default_flobs.flobs/hrfbasisfns.txt"
```
$FSLDIR evaluates to /usr/share/fsl on my system, so if it expanded it would work. feat_model indeed works if I replace the above with:
```
set fmri(default_bfcustom) "/usr/share/fsl/etc/default_flobs.flobs/hrfbasisfns.txt"
```
Is there any easy way to make sure that the shell variable is expanded?
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