Here is a simple modification to get the three months on three columns using the handy pr command:

#!/bin/sh

month=`date +%m`
year=`date +%Y`

nextMonth=$(($month+1))
lastMonth=$(($month-1))

if [[ $nextMonth -gt 12 ]]
then
        nextMonth=1
        year=$(($year+1))
fi

if [[ $lastMonth -eq 0 ]]
then
        lastMonth=12
        year=$(($year-1))
fi

doCal()
{
cal $lastMonth $year
cal | awk '{ if (substr($0,1,2) == " 1")  print "                    1 "; \
do { prevline=$0; if (getline == 0) exit; print " "\
substr(prevline,0) " "; } while (1) }' | \
awk -v cday=`date "+%d"` '{ a=$0; sub(" "fill int(cday)" ","["fill int(cday)"]",a); print  a };'
echo
cal $nextMonth $year
}


doCal | pr -3 -t

This will get you the following result in Terminal:

     June 2004                July 2004             August 2004
 S  M Tu  W Th  F  S    S  M Tu  W Th  F  S    S  M Tu  W Th  F  S
       1  2  3  4  5                1  2  3    1  2  3  4  5  6  7
 6  7  8  9 10 11 12    4  5  6 [7] 8  9 10    8  9 10 11 12 13 14
13 14 15 16 17 18 19   11 12 13 14 15 16 17   15 16 17 18 19 20 21
20 21 22 23 24 25 26   18 19 20 21 22 23 24   22 23 24 25 26 27 28
27 28 29 30            25 26 27 28 29 30 31   29 30 31

but...
while on Terminal the display is correct, GeekTool shows erratic behaviour in some column (a GeekTool displaying bug, I presume; no tabs or other strange characters are contained here).
Any suggestion?

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