#!/bin/bash
# getstats - Every 'n' minutes, grabs netstats values (via crontab).

setglobal logfile = '"/Users/taylor/.netstatlog'"   # change for your configuration
setglobal temp = ""/tmp/getstats.$Pid.tmp""

trap "$[which rm] -f $temp" 0

if test ! -e $logfile  {     # first time run?
  touch $logfile
}
shell { netstat -s -p tcp > $temp

# Check your log file the first time this is run: some versions of netstat 
# report more than one line, which is why the "| head -1" is used here.
setglobal sent = $[grep 'packets sent' $temp | cut -d' ' -f1 | sed 
's/[^[:digit:]]//g' | head -1]
setglobal resent = $[grep 'retransmitted' $temp | cut -d' ' -f1 | sed 's/[^[:digit:]]//g]
setglobal received = $[grep 'packets received$' $temp | cut -d' ' -f1 | \
  sed 's/[^[:digit:]]//g]
setglobal dupacks = $[grep 'duplicate acks' $temp | cut -d' ' -f1 | \
  sed 's/[^[:digit:]]//g]
setglobal outoforder = $[grep 'out-of-order packets' $temp | cut -d' ' -f1 | \
  sed 's/[^[:digit:]]//g]
setglobal connectreq = $[grep 'connection requests' $temp | cut -d' ' -f1 | \
  sed 's/[^[:digit:]]//g]
setglobal connectacc = $[grep 'connection accepts' $temp | cut -d' ' -f1 | \
  sed 's/[^[:digit:]]//g]
setglobal retmout = $[grep 'retransmit timeouts' $temp | cut -d' ' -f1 | \
  sed 's/[^[:digit:]]//g]

/bin/echo -n "time=$[date +%s];"
/bin/echo -n "snt=$sent;re=$resent;rec=$received;dup=$dupacks;"
/bin/echo -n "oo=$outoforder;creq=$connectreq;cacc=$connectacc;"
echo "reto=$retmout"

} >> $logfile

exit 0