Greylisting .. nice ..

[James Gray]

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On 08/11/2006, at 7:12 AM, mikea wrote:
> $ grep graylist /var/log/maillog | wc -l
>     2807
> $ grep "accepted for delivery" /var/log/maillog | wc -l
>     2308
>
> Just now, at 1409 local:
> grep "accepted for delivery" /var/log/maillog | wc -l && grep  
> graylist /var/log/maillog | wc -l
>     2642
>     3115

Just a quick observation that has nothing to do with grey listing :)   
Most *nix admins I know have broken old habits and no longer do the  
old (and unnecessary) "cat <file> | less" in lieu of the more terse  
"less <file>" along with other redundant pipes.  Similarly "grep" can  
count matching lines without the need of piping through "wc" (at  
least I can confirm this with Gnu grep...not sure of the others).

grep <pattern> <file> | wc -l

is effectively the same as

grep -c <pattern> <file>

"man grep" reveals:

- -c, --count
       Suppress normal output; instead print a count of matching  lines
       for  each  input  file.  With the -v, --invert-match option (see
       below), count non-matching lines.

Not sure how BSD/Solaris/AIX/etc grep does things, but the "-c"  
option has been around for ages in Gnu-land and gnu-grep is the  
standard on Mac OSX along with all the Linuxes.

Usual disclaimers apply and YYMV :)

Cheers,

James
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