Shell Script to Reverse a Number

A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. A script that sets up the environment, runs the program, and does any necessary cleanup, logging, etc. is called a wrapper.

In this post, we will write a shell script to reverse a number which is given as the input.

INPUT:
line 1: number

OUTPUT:
Print a single number which is the reverse of the given number

The following is the shell script to reverse a number which is given as the input:

echo enter n
read n
num=0
while [ $n -gt 0 ]
do
num=$(expr $num \* 10)
k=$(expr $n % 10)
num=$(expr $num + $k)
n=$(expr $n / 10)
done
echo number is $num

OUTPUT:

$ enter n
$ 456
$ number is 654

Let us know in the comments if you are having any questions regarding this shell script.

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