Geeklets

Displays in and out bandwidth of your network interfaces. You must also copy the included shell script.

Defaults to en0, the hardwired network interface on (most) macbooks. Invoke with en1 to change to the wireless interface.

Example

network_speed en0 en1
en0 in:  31.48 kbps
en0 out: 1.08 kbps

en1 in:  0.00 kbps
en1 out: 0.00 kbps

The script

#!/bin/zsh
PATH=/usr/sbin:/usr/bin:/bin

seconds=$1
if [ -z "$seconds" ]; then
  seconds=15
else
  shift
fi

divisor=`expr $seconds * 1024`
[ $divisor = 0 ] && divisor=1

[ -z "$*" ] && set "en0"

initial_bytes_in=()
initial_bytes_out=()
subsequent_bytes_in=()
subsequent_bytes_out=()

for interface in $*; do
   b=`netstat -ibI $interface | awk '$3 ~ /Link/ { print $7, $10 }'`
   if [ -z "$b" ]; then
      initial_bytes_in+=(0)
      initial_bytes_out+=(0)
   else
      initial_bytes_in+=(`echo $b | cut -f 1 -d " "` )
      initial_bytes_out+=(`echo $b | cut -f 2 -d " "` )
   fi
   unset b
done

sleep $seconds

for interface in $*; do
   b=`netstat -ibI $interface | awk '$3 ~ /Link/ { print $7, $10 }'`
   if [ -z "$b" ]; then
      subsequent_bytes_in+=(0)
      subsequent_bytes_out+=(0)
   else
      subsequent_bytes_in+=(`echo $b | cut -f 1 -d " "` )
      subsequent_bytes_out+=(`echo $b | cut -f 2 -d " "` )
   fi
   unset b
done

for i in {1..$#*}; do
   printf "$*[$i] in:  %04.2f kbpsn" `echo "scale=2; ($subsequent_bytes_in[$i] - $initial_bytes_in[$i])/$divisor" | bc 2>/dev/null`
   printf "$*[$i] out: %04.2f kbpsn" `echo "scale=2; ($subsequent_bytes_out[$i] - $initial_bytes_out[$i])/$divisor" | bc 2>/dev/null`
done