[Techtalk] ed < file

Dan Richter daniel.richter at wimba.com
Wed Nov 13 10:40:27 EST 2002

>The above command has the effect of passing lots of different arguments
>to ed, no passing it stuff on stdin.
>What you want to do is:
>(cat <<EOF; ) | ed filename

I don't get this. Isn't "cat" reading from stdin in this example? "cat" 
with a command-line argument refers to a file. So why is it stdin for "cat" 
and not for "ed"?

By the way, when I execute your command, I get:
   [dan at scandium dan]$ (cat <<EOF;) | ed index.php
   > 1,$s/foo/bar/g
   > w
   > q
   > EOF
So it looks like it understands the "w" command (hence the second 8090), 
but not the substitution command. But that's progress relative to where I was.

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