Hi Saba, there is a syntax error in the line of the "#if". Please add ":" at the end and report whether the error still occurs. All the best, Jens Von: galaxy-dev-bounces@lists.bx.psu.edu [mailto:galaxy-dev-bounces@lists.bx.psu.edu] Im Auftrag von Saba Sehrish Gesendet: Mittwoch, 19. März 2014 23:07 An: galaxy-dev@lists.bx.psu.edu Betreff: [galaxy-dev] Running a different command based on selection in the tool Hi all, I am trying to write a tool that based on user criteria will run a different script. In the code below, If I select Use_Snapshot, I see the right interface but somehow galaxy tries to execute the #else part and look for "m" input parameter. The example I have seen in documentation is using the script with same name in both if and else and the number of input arguments is the same as well. Any suggestions/ideas why always #else part gets executed although right interface appears based on user selection. Thanks, Saba <command> #if $source.source_select=="Use_Snapshot" cM-snapshot.sh $input $output #else cM.sh $m $b $ns $w $s $z $output #end if </command> <inputs> <conditional name="source"> <param name="source_select" type="select" label="Specify the input"> <option value="Use_Snapshot">Use Snapshot</option> <option value="Set_Values">Set Values</option> </param> <when value="Use_Snapshot"> <param name="input" type="data" format="dbm" size="100" label="Input Snapshot"/> <sanitizer sanitize="False"/> </when> <when value="Set_Values"> <param name="m" label="Omega_m h^2" type="float" value="0.1279" min="0.120" max="0.155"/> <param name="b" label="Omega_b h^2" type="float" value="0.0232" min="0.0215" max="0.0235"/> <param name="ns" label="n_s" type="float" value="0.8629" min="0.85" max="1.05"/> <param name="w" label="w" type="float" value="-1.184" min="-1.30" max="-0.70"/> <param name="s" label="sigma_8" type="float" value="0.6159" min="0.61" max="0.9"/> <param name="z" label="z" type="float" value="1.0" min="0.0" max="1.0"/> <sanitizer sanitize="False"/> </when> </conditional> </inputs>