Exit 1 on failure and change to use /bin/sh

remove_vols

-#!/usr/local/bin/bash
+#!/bin/sh
 # preprocessing for DTI images acquired at FMRIB 
 
 Usage() {
@@ -10,7 +10,7 @@ echo "example: remove_vols data data_rv 4 19 35"
 echo ""
 echo "Note that the first volume is 0 and not 1"
 echo ""
-exit
+exit 1
 }
 
 [ "$1" = "" ] && Usage

replace_and_average_fmrib

-#!/usr/local/bin/bash
+#!/bin/sh
 #averages multiple repeats and simultaneously remove dodgy volumes
 #to be used after regscript - for DTI images acquired at FMRIB 
 
@@ -29,7 +29,7 @@ echo "you should therefore type something like - "
 echo "              replace_and_average_fmrib 3 4 5 73 82 166" 
 echo "_________________________________________________________________________"
 
-exit
+exit 1
 }
 
 #===================================================================