Answering my own question of last week....
 
Here's a Unix trick that will identify all the subscribers set to
Nomail.  It works fine in SCO Unix and might work in other flavors.
 
sed -n -e 'N' -e 's/\n//' -e '/ m /p' $1
 
Save this line as a file in your bin directory (I called this
file "slep" after the grep commmand).  Be sure to change permissions so
you have rx access to it.
 
To use it:
 
1. get your list from listserv with (NOLOCK
 
2. save the list as a file in your home directory
 
3. at the Unix prompt enter:   slep [filename]
 
This will produce a list of all subscribers who are set to nomail
 
You can direct the output into a file with:
 
slep [filename] > [target file]
 
I hesitate posting this in case other systems are set up differently, but
here it is anyway for those who want to experiment with it.
 
Thanks to Tom Robb (TESL-L) and Doug Winship for direction
Big thanks to Larry Miller (sys admin) for Unix savvy.
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              Roy Bowers <[log in to unmask]>
        Center for Biological Research,  La Paz,  Mexico