DS20 aid needed

[Tom Droege <tdroege2@earthlink.net>]

Those of you that have actually worked on DS20 should be able to handle 
this one.

As you know, the dark files are incorrectly labeled "bias" in the fits 
headers.  How can I do a global edit on a directory of .fits files to 
change the "bias" to "dark"?  (If worst comes to worst, I will just go take 
a new set of darks, but it seems like it will be useful to know how to do 
this.)

I am now running my Linux system and beginning to get familiar with it's 
use, but it is still a struggle.  I am even using vi to edit instead of the 
graphical editor.  Where in the world did they come up with that awful key 
grouping?  They obviously gave no thought to ease of use.  hjkl requires 
moving off the home keys.  :q!  Indeed!  Two shifts!!  This does not even 
make sense on a KSR33.

In any case, I am ready to try to load some utility to edit the .fits 
header.  Chris, as you know, I have cl on the machine you set up for 
me.  Will just putting cl into my /usr/bin directory get me IRAF, or are 
there other files to move also?

While I am asking questions,

1.  Mandrake 8.1 lists directories in splendifferous colors.  Red, blue, 
green, even blinking!  What do the colors mean?  What does a trailing * 
mean?  Looks like you get a ~ on a changed version of a file?  I seem to 
have piles of Linux books, but none seem to be properly indexed.  I do like 
the Unix course text.  "Practical UNIX" by Steve Moritsugu.

2.  I still have a problem with mount.  I can only umount the cdrom from 
the directory where I mounted it.  Is this the way it works?

Tom Droege