#!/bin/bash
# Bash shell script to reverse text file contain i.e. concatenate files and
# print on the standard output in reverse. This script also demonstrate how
# to use arrays under bash shell script.
FILE="$1"
if [ $# -eq 0 ]; then
echo "$(basename $0) - file-name"
exit 1
fi

textArray[0]="" # hold text
c=0 # counter
# read whole file in loop
while read line
do
textArray[c]=$line # store line
c=$(expr $c + 1) # increase counter by 1
done < $FILE
# get length of array
len=$(expr $c - 1 )

# use for loop to reverse the array
for (( i=$len; i>=0; i-- ));
do
echo ${textArray[$i]}
done