afni.nimh.nih.gov

Hi Rick,
Thanks for your reply！
I have no idea to fix this problem since I posted this question.
This is the output using your command.

(BTW, I use ubuntu 16.04 subsystem within windows 10.)

lzyang@~$ tcsh -c 'echo $noclobber'
noclobber: Undefined variable.
lzyang@~$ bash -c 'echo $noclobber'

lzyang@~$

As you see, tcsh reported that this is an undefined variable. But the bash report nothing.

Thanks very much for your help!
-lz