command line throws an exception if the cmd cannot be found
command line throws an exception if the cmd cannot be found

git-svn-id: 24f545668198cdd163a527378499f2123e59bf9f@1821 ead46cd0-7350-4e37-8683-fc4c6f79bf00

rameshvs/nipype,dmordom/nipype,FCP-INDI/nipype,mick-d/nipype,carlohamalainen/nipype,rameshvs/nipype,JohnGriffiths/nipype,JohnGriffiths/nipype,carlohamalainen/nipype,sgiavasis/nipype,blakedewey/nipype,arokem/nipype,FredLoney/nipype,gerddie/nipype,fprados/nipype,iglpdc/nipype,FCP-INDI/nipype,grlee77/nipype,iglpdc/nipype,fprados/nipype,mick-d/nipype_source,blakedewey/nipype,carlohamalainen/nipype,arokem/nipype,pearsonlab/nipype,rameshvs/nipype,iglpdc/nipype,christianbrodbeck/nipype,sgiavasis/nipype,grlee77/nipype,dgellis90/nipype,mick-d/nipype,FredLoney/nipype,carolFrohlich/nipype,dgellis90/nipype,pearsonlab/nipype,carolFrohlich/nipype,FredLoney/nipype,dmordom/nipype,pearsonlab/nipype,carolFrohlich/nipype,blakedewey/nipype,FCP-INDI/nipype,Leoniela/nipype,glatard/nipype,dgellis90/nipype,wanderine/nipype,arokem/nipype,grlee77/nipype,wanderine/nipype,carolFrohlich/nipype,sgiavasis/nipype,FCP-INDI/nipype,JohnGriffiths/nipype,arokem/nipype,glatard/nipype,christianbrodbeck/nipype,mick-d/nipype,JohnGriffiths/nipype,gerddie/nipype,blakedewey/nipype,dgellis90/nipype,pearsonlab/nipype,fprados/nipype,sgiavasis/nipype,mick-d/nipype_source,Leoniela/nipype,satra/NiPypeold,mick-d/nipype_source,mick-d/nipype,iglpdc/nipype,satra/NiPypeold,glatard/nipype,gerddie/nipype,gerddie/nipype,dmordom/nipype,glatard/nipype,Leoniela/nipype,wanderine/nipype,grlee77/nipype,rameshvs/nipype,wanderine/nipype