MNT: Use platform independent syntax for finding eddy executable

fsl_course/fdt1/test_topup_eddy.sh

@@ -35,18 +35,18 @@ applytopup --imain=$outdir/nodif,$subdatadir/nodif_PA --topup=$outdir/topup_AP_P
 bet $outdir/hifi_nodif $outdir/hifi_nodif_brain -m -f 0.2
 
 # Correct for eddy currents, actually just make sure eddy ( both pre- and post- 5.0.9 naming scheme) runs and then simulate CTRL+C ( as per course instructions )
-if [ `which -s eddy_openmp; echo \$?; exit 0` -eq "0" ]; then
-eddy_openmp --imain=$subdatadir/dwidata --mask=$outdir/hifi_nodif_brain_mask \
-  --index=$subdatadir/index.txt --acqp=$subdatadir/acqparams.txt \
-  --bvecs=$subdatadir/bvecs --bvals=$subdatadir/bvals \
-  --fwhm=0 --topup=$outdir/topup_AP_PA_b0 --flm=quadratic \
-  --out=$outdir/eddy_unwarped_images & sleep 10; kill -TERM $!
-elif [ `which -s eddy; echo \$?; exit 0` -eq "0" ]; then
-eddy --imain=$subdatadir/dwidata --mask=$outdir/hifi_nodif_brain_mask \
-  --index=$subdatadir/index.txt --acqp=$subdatadir/acqparams.txt \
-  --bvecs=$subdatadir/bvecs --bvals=$subdatadir/bvals \
-  --fwhm=0 --topup=$outdir/topup_AP_PA_b0 --flm=quadratic \
-  --out=$outdir/eddy_unwarped_image & sleep 10; kill -TERM $!
+if which eddy_openmp &> /dev/null; then
+    eddy_openmp --imain=$subdatadir/dwidata --mask=$outdir/hifi_nodif_brain_mask \
+      --index=$subdatadir/index.txt --acqp=$subdatadir/acqparams.txt \
+      --bvecs=$subdatadir/bvecs --bvals=$subdatadir/bvals \
+      --fwhm=0 --topup=$outdir/topup_AP_PA_b0 --flm=quadratic \
+      --out=$outdir/eddy_unwarped_images & sleep 10; kill -TERM $!
+elif which eddy_openmp &> /dev/null; then
+    eddy --imain=$subdatadir/dwidata --mask=$outdir/hifi_nodif_brain_mask \
+      --index=$subdatadir/index.txt --acqp=$subdatadir/acqparams.txt \
+      --bvecs=$subdatadir/bvecs --bvals=$subdatadir/bvals \
+      --fwhm=0 --topup=$outdir/topup_AP_PA_b0 --flm=quadratic \
+      --out=$outdir/eddy_unwarped_image & sleep 10; kill -TERM $!
 fi
 
 cp $subdatadir/pre_baked/eddy_unwarped_images* $outdir