Re: procmailrc syntax

On 2016-10-28 22:07, Zhiliang Hu wrote:
> Although I used procmail for so long I never figure out what kind of =

> "script" rules it follows.  For example in one of my rc script I try =

> to calculate a list file ("dist"):
>
>   DISTCOUNT=3D`grep -cv '^(' dist` -1
>
> the calculation part fails, end up in the log:
>
>   procmail: Skipped "-1"
>
> How can I get over this without getting it to external script for a =

> simple calculation like this?

 From procmailrc(5):

        The assignments and  substitutions  of  these  environment
        variables are handled exactly like in sh(1) (that includes
        all possible quotes and escapes),  with  the  added  bonus
        that  blanks  around the '=3D' sign are ignored and that, if
        an environment variable appears without a trailing '=3D', it
        will  be  removed  from  the  environment.  Any program in
        backquotes started by procmail will have the  entire  mail
        at its stdin.


Complete with safeguards against an empty grep result:

sh -c "VAR1=3D`grep -cv '^(' dist`;let DISCOUNT=3D${VAR1:-0}-1"

-- =

Klaus Johannes Rusch
[email protected]
http://klausrusch.atmedia.net/