Shell Programming and Scripting

new=101
while (( new<200 ))
do
   (( old = 200 - new ))
   cp $old $new
   (( new += 1 ))
done

for (( new=101; new<200; new++ ))
do
   (( old = 200 - new ))
   cp $old $new
done

cp 99 101
cp 98 102
cp 97 103
cp 96 104
cp 95 105
. . .
cp 5 195
cp 4 196
cp 3 197
cp 2 198
cp 1 199

for (( new=101; new<200; new++ ))
do
   (( old = 200 - new ))
   cp abc$old.png abc$new.png
done

#!/bin/bash

case $# in 4);; *) echo "Syntax: $0 base new prefix suffix" >&2; exit 2;; esac

base=$1
top=$2
prefix=$3
suffix=$4

for (( new=$base; new<$top; new++ ))
do
   (( old = $top - new ))
   cp $prefix$old$suffix $prefix$new$suffix
done