UNIX for Dummies Questions & Answers

#!/bin/ksh
string=`cat Date.txt`
year=`echo $string | cut -c 1-4`
month=`echo $string | cut -c 5-6`
echo $year$month
mon=`expr $month + 1`
if [ $mon -lt 10 ]; then
mon=0$mon
echo $mon
fi
if [ $mon -gt 12 ]; then
        month=01
        year=`expr $year + 1`
echo " I am here "
else
        month=$mon
echo " I am the same year $month"
fi
echo $year$month
String1=$year$month
echo String1=$String1
echo $String1> Date.txt

read STRING < date.txt

echo "${STRING:1:2}"

#! /usr/bin/ksh

read date < Date.txt
year=${date%??}
month=${date#????}
echo month = $month
if (( month == 12)) ; then
        next=$((year+1))01
else
        typeset -Z2 nmonth=$((month+1))
        next=${year}${nmonth}
fi
echo next = $next
echo $next > Date.txt
exit 0