[help with grep]

GDHough mr6re9-mI4xJ4qlgtBiLUuM0BA3LQ at public.gmane.org
Mon Dec 15 12:04:39 UTC 2003

Please, there must be an easier way...

I am trying to automate my self induced weekly ADMIN duties. I mull through my 
logs on Sunday morning after rotation. They have gotten pretty big since the 
end of August so I sought a means to parse some files for information without 
having to scroll through 20,000 lines.

One nagging problem for me is with grep. For example, if I:

grep DPT=22 /var/log/messages.1 | cat > somefile

somefile would contain not only DPT=22, but also all 220, 2276, 22344 or any 
port 22xxx. I tried the symbols \>, \b, \B thinking they would match the 
emptyness at the end of DPT=22 but they did not work for me. Laugh if you 
must but my solution to this dilema was to get DPT=22 by elimination using 
the invert switch -v like so:

grep -v DPT=220 $DIRPATH/DPT/A | cat > $DIRPATH/DPT/B
grep -v DPT=221 $DIRPATH/DPT/B | cat > $DIRPATH/DPT/C
grep -v DPT=222 $DIRPATH/DPT/C | cat > $DIRPATH/DPT/D
grep -v DPT=223 $DIRPATH/DPT/D | cat > $DIRPATH/DPT/E
grep -v DPT=224 $DIRPATH/DPT/E | cat > $DIRPATH/DPT/F
grep -v DPT=225 $DIRPATH/DPT/F | cat > $DIRPATH/DPT/G
grep -v DPT=226 $DIRPATH/DPT/G | cat > $DIRPATH/DPT/H
grep -v DPT=227 $DIRPATH/DPT/H | cat > $DIRPATH/DPT/I
grep -v DPT=228 $DIRPATH/DPT/I | cat > $DIRPATH/DPT/J
grep -v DPT=229 $DIRPATH/DPT/J | cat > $DIRPATH/DPT/dp22
echo "DPT=22"
grep -c farm $DIRPATH/DPT/dp22

I search for about 40 ports both source and destination. Most high numbered 
ports don't require the elimination method like 8080 because 80800 doesn't 

After I get the common ports catalogued, I hope to use diff to find what's 
left-over and flag those lines with same source and destination ports. Can I 
simplify the above and thus remove much of the sleep in the script?

Shouldn't grep DPT=22\> work? That's what I'm seeing in the man page.
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