12-21-2001
That looks OK, except that "rename" should be "mv" (slipping back into DOS mode, are you?)
The mv will clobber any existing files in the way, such as an older df01. If you want protection from this, then use mv -i, or your loop could check for existence before the mv.
Also, if you are going to cut exactly two columns, you should drive off of Nov??_df instead of Nov*_df. If you use asterisk, and you happen to have:
Nov01_df
Nov01b_df
you would rename the first entry to df01, then you would rename the second entry to df01 also, thus overlaying the first entry. Using Nov??_df will be consistent with cutting two characters.
Or if you do want to process Nov*_df files, you could use the following for your Nname assignment:
Nname=`expr $x : "Nov\(.*\)_df"`df
And an attempt at answering your BTW:
mv is simply not designed to rename a series of files into a series of new filenames. And I believe that the filename pattern matching expansion is done by the shell before mv ever sees it. Therefore:
mv Nov??_df mydir
would get changed to
mv Nov01_df Nov02_df Nov03_df mydir
before mv sees it. The mv command never gets to see the pre-expanded command.
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