Dear all I am using this control to allow the user to input multiple files: <param name="input_vcfs" type="data" multiple="true" format="vcf" label="Input VCF file(s)" /> and I am using this for loop in the cheetah code to access the control: <command interpreter="bash"> script.sh ... #for $i, $input_vcf in enumerate( $input_vcfs ): "${input_vcf}", #end for </command> It appears that when a user selects many files (25 in this case) the bash command in the command tag never gets executed. Therefore the job is never queued. The history item shows 'Waiting to run' indefinitely. Calling the script.sh manually with 25 input files works fine. Any hint as to how to debug this would be greatly appreciated. Thanks a lot Ulf ************************************************************************** The information contained in the EMail and any attachments is confidential and intended solely and for the attention and use of the named addressee(s). It may not be disclosed to any other person without the express authority of Public Health England, or the intended recipient, or both. If you are not the intended recipient, you must not disclose, copy, distribute or retain this message or any part of it. This footnote also confirms that this EMail has been swept for computer viruses by Symantec.Cloud, but please re-sweep any attachments before opening or saving. http://www.gov.uk/PHE **************************************************************************