Hi all I've just installed cygwin and fsl on win2000(2.4G 512M). With no experience of Unix, I now have some small questions. 1.When I lauch fsl, the GUI window appears, and there's another window called fsl, showing this message: Your group is currently "mkpasswd". This indicates that the /etc/passwd (and possibly /etc/group) files should be rebuilt. See the man pages for mkpasswd and mkgroup then, for example, run mkpasswd -l [-d] > /etc/passwd mkgroup -l [-d] > /etc/group Note that the -d switch is necessary for domain users. Can anyone tell me what this means? 2. I want to use the avwmerge function, but at first the system always shows that $ avwmerge -t out4d E:/sara/1/session/snrr1D*.hdr AvwOpen: Error while opening header!: No such file or directory avwmerge: No such file or directory seems the system can't locate the input file even I provide the directory. Is it true that under cygwin all input files must be under the cygwin/usr/local directory? And the output file will be saved in this directory by default? i'm really confused about this. Thanks in advance for any help. Best, Sara