How to Write grep in Emacs Lisp (tutorial)

[Petter Gustad]

rpw3 at rpw3.org (Rob Warnock) writes:

> invocation was given only one arg!! IT FOUND THE PATTERN, BUT DIDN'T
> TELL ME WHAT !@^%!$@#@! FILE IT WAS IN!!  :-{

Sounds frustrating, but grep -H will always print the filename, even
when given a single filename on the command line.

//Petter
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