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I'm working on some SPAM graphing with mrtg and gnuplot, and have run into a bit of a conversion I'd like to try to migrate to perl. Basically I have the following:
grep ^"From " SPAM-mbox | \ awk '{$1 = $2 = $6 = ""; \ gsub(/-0[45]00/, ""); \ gsub(" ", "-"); \ print $0}' | \ sort | \ sed s/-$//g | \ uniq -c > spamstatfile

This returns the following:

1 --Fri-Jun-13--2003 1 --Fri-Jun-20--2003 2 --Mon-Jun-9--2003 10 --Tue-Jun-24--2003 3 --Wed-Jun-11--2003 1 --Wed-Jun-18--2003

What I'm trying to do, is swap the first and second columns, but I can't figure out how to easily do that (either with awk's backtracking, or with this converted into a perl one-liner). Once I can do this (without manually swapping the columns), I'll be shoving it into gnuplot with:

set xdata time set timefmt "%b-%d-%Y" plot "spamstatfile" using 1:2

Any ideas on how I can swap those columns either with perl or awk? Or perhaps a better way to do this entirely in perl?

Update:
jmacnamara's suggestion got me 99.99% of the way there. Here's a slightly-modified version which now works:

perl -lane '$h{"$F[3]-$F[4]-$F[6]"}++ if /^From /; END { print $_, "\t", $h{$_} for keys %h }' SPAM > spamdates

And then I just run gnuplot -persist spam.gnuplot across my control file. Done.

Now to fancy it up a bit and add more heuristics.


In reply to Perlify some awk'ing for SPAM graphing by hacker

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