10-03-2012
Good Morning,
Thank you for the quick response. All this bash scripting is new to me so I will go over in great detail what was just written to understand this code. I need to get this stuff in my head and the only way to do it for me is just to "do it". I appreciate you being a mentor.
I will let you know how it runs.
regards,
al
---------- Post updated at 07:20 AM ---------- Previous update was at 06:52 AM ----------
Good Morning,
I am reading the code over and I did some research on the portion | grep -v grep|. The formula is grep pattern filename1 filename2.
I can't seem to understand why this is done nor where the -v is coming from.
A brief explanation would be appreciated.
thanks
al
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LEARN ABOUT MOJAVE
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)