A tutorial of Mathematical Operation methods commonly used in Shell script programming
This article mainly introduces "Shell script programming commonly used mathematical operation method tutorial", in daily operation, I believe many people in Shell script programming commonly used mathematical operation method tutorial problems have doubts, small make up consult all kinds of information, sort out simple and easy to use operation method, hope to answer "Shell script programming commonly used mathematical operation method tutorial" doubts helpful! Next, please follow the small series to learn together!
addition operation
Create a new file "Addition.sh", enter the following and give it executable permissions.
The code is as follows:
#!/ bin/bash
echo "Enter the First Number: "
read a
echo "Enter the Second Number: "
read b
x=$(expr "$a" + "$b")
echo $a + $b = $x
Output:
The code is as follows:
[root@tecmint ~]# vi Additions.sh
[root@tecmint ~]# chmod 755 Additions.sh
[root@tecmint ~]# ./ Additions.sh
"Enter the First Number: "
12
"Enter the Second Number: "
13
12 + 13 = 25
subtraction operation
The code is as follows:
#!/ bin/bash
echo "Enter the First Number: "
read a
echo "Enter the Second Number: "
read b
x=$(($a - $b))
echo $a - $b = $x
Note: here we do not use "expr" to perform mathematical operations as in the example above.
Output:
The code is as follows:
[root@tecmint ~]# vi Substraction.sh
[root@tecmint ~]# chmod 755 Substraction.sh
[root@tecmint ~]# ./ Substraction.sh
"Enter the First Number: "
13
"Enter the Second Number: "
20
13 - 20 = -7
multiplication operation
The code is as follows:
#!/ bin/bash
echo "Enter the First Number: "
read a
echo "Enter the Second Number: "
read b
echo "$a * $b = $(expr $a \* $b)"
Output:
The code is as follows:
[root@tecmint ~]# vi Multiplication.sh
[root@tecmint ~]# chmod 755 Multiplication.sh
[root@tecmint ~]# ./ Multiplication.sh
"Enter the First Number: "
11
"Enter the Second Number: "
11
11 * 11 = 12
division operation
The code is as follows:
#!/ bin/bash
echo "Enter the First Number: "
read a
echo "Enter the Second Number: "
read b
echo "$a / $b = $(expr $a / $b)"
Output:
generation
[root@tecmint ~]# vi Division.sh
[root@tecmint ~]# chmod 755 Division.sh
[root@tecmint ~]# ./ Division.sh
"Enter the First Number: "
12
"Enter the Second Number: "
3
12 / 3 = 4
array
The script below prints a set of numbers.
The code is as follows:
#!/ bin/bash
echo "Enter The Number upto which you want to Print Table: "
read n
i=1
while [ $i -ne 10 ]
do
i=$(expr $i + 1)
table=$(expr $i \* $n)
echo $table
done
Output:
The code is as follows:
[root@tecmint ~]# vi Table.sh
[root@tecmint ~]# chmod 755 Table.sh
[root@tecmint ~]# ./ Table.sh
"Enter The Number upto which you want to Print Table: "
29
58
87
116
145
174
203
232
261
290
You can download the code for this example from here
judgement parity
The code is as follows:
#!/ bin/bash
echo "Enter The Number"
read n
num=$(expr $n % 2)
if [ $num -eq 0 ]
then
echo "is a Even Number"
else
echo "is a Odd Number"
fi
Output:
The code is as follows:
[root@tecmint ~]# vi EvenOdd.sh
[root@tecmint ~]# chmod 755 EvenOdd.sh
[root@tecmint ~]# ./ EvenOdd.sh
Enter The Number
12
is a Even Number
1
2
3
4
5
[root@tecmint ~]# ./ EvenOdd.sh
Enter The Number
11
is a Odd Number
Factorial number
The code is as follows:
#!/ bin/bash
echo "Enter The Number"
read a
fact=1
while [ $a -ne 0 ]
do
fact=$(expr $fact \* $a)
a=$(expr $a - 1)
done
echo $fact
Output:
The code is as follows:
[root@tecmint ~]# vi Factorial.sh
[root@tecmint ~]# chmod 755 Factorial.sh
[root@tecmint ~]# ./ Factorial.sh
Enter The Number
12
479001600
You can download the code for this example here
Judge Armstrong number
Armstrong numbers: Among three-digit positive integers, such as abc, there are some that satisfy (a^3)+(b^3)+(c^3)=abc, i.e., the cube sum of the digits is exactly the number itself. These numbers are called Armstrong numbers.
The code is as follows:
#!/ bin/bash
echo "Enter A Number"
read n
arm=0
temp=$n
while [ $n -ne 0 ]
do
r=$(expr $n % 10)
arm=$(expr $arm + $r \* $r \* $r)
n=$(expr $n / 10)
done
echo $arm
if [ $arm -eq $temp ]
then
echo "Armstrong"
else
echo "Not Armstrong"
fi
Output:
The code is as follows:
[root@tecmint ~]# vi Armstrong.sh
[root@tecmint ~]# chmod 755 Armstrong.sh
[root@tecmint ~]# ./ Armstrong.sh
Enter A Number
371
371
Armstrong
1
2
3
4
5
6
[root@tecmint ~]# ./ Armstrong.sh
Enter A Number
123
36
Not Armstrong
prime number judgment
The code is as follows:
#!/ bin/bash
echo "Enter Any Number"
read n
i=1
c=1
while [ $i -le $n ]
do
i=$(expr $i + 1)
r=$(expr $n % $i)
if [ $r -eq 0 ]
then
c=$(expr $c + 1)
fi
done
if [ $c -eq 2 ]
then
echo "Prime"
else
echo "Not Prime"
fi
Output:
The code is as follows:
[root@tecmint ~]# vi Prime.sh
[root@tecmint ~]# chmod 755 Prime.sh
[root@tecmint ~]# ./ Prime.sh
"Enter Any Number"
12
"Not Prime"
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