12-29-2001
Re: One Step Back
Quote:
Originally posted by darthur
Perderabo,
I tried your suggestion....
echo qmgrcount = $qmgrcount > /dev/tty
but this just outputs "qmgrcount =" when it gets to this part of the function.
This tells that the value of qmgrcount is null or just white space at the point of the echo. That is not what you expected, right? So you are zeroing in on the bug. Think what value you expected for qmgrcount. Until you fix the line that sets qmgrcount your script isn't going to work. You have effectively done this:
qmgrcount=""
just before your if statement. And as we said your if statement will only do something if qmgrcount is 0 or 1 or 2.
This is how I debug my scripts. I put in echo statements to see what values are being set to my variables. When I find a variable whose value doesn't look right, I work with the script until I get it right.
A few posts ago, you spoke of piping the output of wc -l to cut to extract the 8th field. That is crazy, there is no 8th field.
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LEARN ABOUT FREEBSD
escape
escape(1) Mail Avenger 0.8.3 escape(1)
NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO
avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)