'fsl_glm -i input.nii.gz -o glm -d design.mat -c contrast.con --out_cope' Do you need to give a name of the --out_cope option. 'fsl_glm -i input.nii.gz -o glm -d design.mat -c contrast.con --out_cope=test.txt' -yingying >>> Arnold Evia <[log in to unmask]> 10/20/2011 2:24 PM >>> Thanks for the reply, I tried using the command but when I ran the command 'fsl_glm -i input.nii.gz -o glm -d design.mat -c contrast.con --out_cope', it returns the error '--out_cope: Missing non-optional argument!' After experimenting with the options, I found that using --in instead of -i in the command yields the same error, 'Missing non-optional argument!'. I suspect that the problem lies within the -- syntax. If anyone has any insight or the solution to this problem, it would be really appreciated. Thanks! -Arnold