Shell Programming and Scripting

dear sages,
please tell me what's wrong with the following script:

#!/bin/sh
#usage yd2ymd 1998213
# if there is no command line argument, assume one is being
# piped in and read it
if [ X$1 = X ]
then
read dt
else
dt=$1
fi

# break apart the year and the days

y=`expr $dt / 1000`
d=`expr $dt % 1000`

# subtract the number of days in each month starting from 1
# from the days in the date. When the day goes below 1, you
# have the current month. Add back the number of days in the
# month to get the correct day of the month
m=1
while [ `expr $d \> 0` = 1 ]
do
md=`sh monthdays $y $m`
d=`expr $d \- $md`
m=`expr $m \+ 1`
done

d=`expr $d \+ $md`

# the loop steps one past the correct month, so back up the month
m=`expr $m \- 1`

# assemble the results into a gregorian date
grg=`expr \( $y \* 10000 \) \+ \( $m \* 100 \) \+ $d`
echo $grg

---------------------
and all that resulted in --
---------------------
yd2ymd: 38: Syntax error: end of file unexpected (expecting "do")
# % >

Note: the script was copied from a tutorial, I only added "sh" in the line--
md=`monthdays $y $m`

to avoid "not found" message; the monthdays file is in its place and working OK.

yours`
serguey

The script did not give me that error. It seemed to run fine.

Ruby:

Code:

# convert, for example, 2005321 to 20051117

require 'date'

# If no command-line argument, read STDIN.
date = ARGV.first || gets.chomp!

puts Date.new2( date[0,4].to_i, date[-3,3].to_i ).to_s.gsub(/-/,"")

It's nice to know that some place the script can do what is expected:
However, I'd like to know what it wants to run in this here box of mine.
By the by, what's your PC's case color?

yours`
serguey

please do not drive me so fast.
Where in the original script should I insert your generous line?
(I'm not so agile with sh-shell-scripting and need some more instructive clues.)

yours`
serguey

hmm
how about replacing the line

while [ `expr $d \> 0` = 1 ]

by
while [ `expr $d \> 0` -eq 1 ]

I swapped the unexpected "=" for -eq.
Please, peruse:
Script started on Wed Dec 28 11:19:31 2005
# sh -v yd2ymd 1998321
if [ X$1 = X ]
then
read dt

else
dt=$1

fi


y=`expr $dt / 1000`

d=`expr $dt % 1000`

m=1

while [ `expr $d \> 0` -eq 1 ]

do
md=`sh monthdays $y $m`
d=`expr $d \- $md`
m=`expr $m \+ 1`

done
expr: illegal option -- 1
usage: expr [-e] expression
[: -eq: unexpected operator

d=`expr $d \+ $md`
expr: illegal option -- 1
usage: expr [-e] expression

m=`expr $m \- 1`

grg=`expr \( $y \* 10000 \) \+ \( $m \* 100 \) \+ $d`
expr: syntax error
echo $grg
===============================
yours`
serguey