#!/bin/sh 

# laboratory work 21
# task 12
# subtask 1

FN=$1
FN=${FN:="NULL"}
if [ $FN = "NULL" ]
then
  echo -n "Please, enter name of file: "
  read FN
fi 

PF=$2
PF=${PF:="NULL"}
if [ $PF = "NULL" ]
then
  echo -n "Please, enter postfix of first copie: "
  read PF
fi 

LE=$3
LE=${LE:="NULL"}
if [ $LE = "NULL" ]
then
  echo -n "Please, enter the number of copies: "
  read LE
fi

LI="1"
while [ "$LI" -le "$LE" ]
do
  cp $FN "${FN}${PF}"
  PF=`echo $PF | tr '1-9a-zA-Y' '2-9a-zA-Z'`
  LI=`expr $LI + 1`
done