This is an escape character. In your command it means: don't treat this space as a special character - not sure what that does. You might see it when there's a space in a file name or a script splits the command over several lines. In this case it isn't required and is clearly causing the shell to mis-interpret the rest of the line. Remove it.
--
Dave Flitney
IT Manager, FMRIB Centre
On 28 Sep 2012, at 00:30, Mark Tseng <[log in to unmask]> wrote:
> It is weird that, when I delete the backslash "\", a denoise_ICAfiltered.nii.gz file is produced.......
>
> So should I delete "\" ?
>
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