M-x grep: time to clean up /dev/null kludge

[Dan Jacobson]

You know, something has to be done about /dev/null kludge in M-x grep:
(grep "grep -n -e www *|wc")

cd ~/geocities/
grep -n -e www *|wc /dev/null
      0       0       0 /dev/null

grep finished (matches found) at Sat Sep 15 10:21:46

I mean I know it is there to modify grep output in the minimal case of
one file name etc.  But, then useful commands like

(grep "grep -n -e www *|grep -v http://";)

are precluded.  I know what you are going to say: "M-x grep was not
intended for such complex uses.  If you want complex uses, use M-x
compile."  However, one often starts with simple uses, refines and
refines, and then just wants to add a tiny pipe at the end...
That they must then copy everything over to an M-x compile command is
kind of laborsome.
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