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Dear Mark This is great news! Thanks for your help, z From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Mark Jenkinson Sent: 19 April 2013 17:19 To: [log in to unmask] Subject: Re: [FSL] fdt_rotate_bvecs Hi Zita, I assume you are running on an Ubuntu/Debian system. If so, try changing the first line of the script to: #!/bin/bash instead of: #!/bin/sh Oh, and the script is now official, as of FSL 5.0.2. :) All the best, Mark On 19 Apr 2013, at 16:40, "Patai, Zita" <[log in to unmask]<mailto:[log in to unmask]>> wrote: Dear FSL I realize that this script is not 'official', but since it exists I was trying to use it as I have 3 acquisitions per subject. I am using it as: fdt_rotate_bvecs original_bvecs output ecc_logfile and get this error (I am only showing the last bit, but this exists for all images in the series, which is 63): /usr/share/fsl/5.0/bin/fdt_rotate_bvecs: 29: [: processing dti_ec_tmp0062: unexpected operator /usr/share/fsl/5.0/bin/fdt_rotate_bvecs: 67: /usr/share/fsl/5.0/bin/fdt_rotate_bvecs: let: not found I can't seem to get around this error, and I have checked my ecc_logfile and it looks fine. Also, it creates an output file, but it only has 3 zeros in it. Please let me know if there is a solution! Many thanks zita _________________________ Eva Zita Patai Postdoctoral Research Associate UCL, Institute of Child Health [log in to unmask]<mailto:[log in to unmask]> 020 7905 2730