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List:       procmail
Subject:    Re: Just invoking a program
From:       "David W. Tamkin" <dattier () ripco ! com>
Date:       2001-04-26 3:20:43
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Paul Foster asked,

| Recipe:
| 
| :0
| * ^Subject: something <\/.*>
| {
| 	:0 c
| 	bounce
| 
| 	:0 w
| 	| here's the part I don't know
| }

| Okay, now normally if you put that pipe symbol before the action line,
| it pipes the email in question to whatever command you've specified. In
| this case, I don't want it to do that. I simply want a program to start
| and be passed the contents of the $MATCH variable. In other words, I
| want to throw away the whole content of the message, headers and all,
| and start over, with only the contents of $MATCH to go on.

General answer first: if the command requires the value of $MATCH on the
command line,

 :0wi
 | command "$MATCH"

or if it requires the contents of $MATCH as standard input,

 :0wi
 | echo "$MATCH" | command

The `i' flag is needed to tell procmail not to treat the situation as a write
error when the command (in the first form, or echo in the second) doesn't
finish [in this case, doesn't even start] reading in the message text that
procmail tries to feed it.

Specific comments:

 :0
 * ^Subject: something <\/.*>
 # you probably don't want the closing angle bracket in the value of MATCH
 * MATCH ?? ^^\/[^>]+
 {
 # unless "bounce" is a directory, the save to it needs a local lockfile
 	:0 c:
 	bounce
 
 	:0iw
 	| command "$MATCH" # or echo "$MATCH" | command
 }

Since you're using a `w' flag, be prepared to deal with procmail's exiting
the braces and continuing to read recipes if the command returns a non-zero
exit status.

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