Shell Programming and Scripting

A2008
A2408
A2808

A1908 is missing
A2108 is missing
.....

#! /bin/ksh
i=`ls A* |cut -c2-3`
j=`date +%m`
while [ $i -le 30 -o $i -eq 31 ] //$i is taking three values 20 24 28 (in this wants to check individually )
do
  if [ ! -f A$i$j ]
  then
    echo A${i}${j} is missing
  fi
  i=`expr $i + 1`
done

for k in $i
do
    echo $k
done

[ 20 24 28 -le 30 -o 20 24 28 -eq 31 ]
aa02[7]: 24: unknown test operator
[ 20 24 28 -le 30 -o 20 24 28 -eq 31 ]
aa02[7]: 24: unknown test operator
[ 20 24 28 -le 30 -o 20 24 28 -eq 31 ]
aa02[7]: 24: unknown test operator

#! /bin/ksh
i=`ls A* |cut -c2-3`
j=`date +%m`

for k in $i 
do
     if [ ! -f A$k$j ]
     then
           echo A${k}${j} is missing
      fi
done