This section mainly discusses the mathematical related shell script programming.
Addition operations
Create a new file "addition.sh", enter the following and give it executable permissions.
Copy Code code as follows:
#!/bin/bash
echo "Enter the" number: "
Read a
echo "Enter The Second Number:"
Read B
x=$ (expr "$a" + "$b")
echo $a + $b = $x
Output results:
Copy Code code as follows:
[Root@tecmint ~]# VI additions.sh
[Root@tecmint ~]# chmod 755 additions.sh
[Root@tecmint ~]#./additions.sh
"Enter the": "
12
"Enter The Second Number:"
13
12 + 13 = 25
Subtraction operations
Copy Code code as follows:
#!/bin/bash
echo "Enter the" number: "
Read a
echo "Enter The Second Number:"
Read B
x=$ (($a-$b))
echo $a-$b = $x
Note: Here we do not use "expr" as the example above to perform mathematical operations.
Output results:
Copy Code code as follows:
[Root@tecmint ~]# VI substraction.sh
[Root@tecmint ~]# chmod 755 substraction.sh
[Root@tecmint ~]#./substraction.sh
"Enter the": "
13
"Enter The Second Number:"
20
13-20 =-7
Multiplication operations
Copy Code code as follows:
#!/bin/bash
echo "Enter the" number: "
Read a
echo "Enter The Second Number:"
Read B
echo "$a * $b = $ (expr $a \* $b)"
Output results:
Copy Code code as follows:
[Root@tecmint ~]# VI multiplication.sh
[Root@tecmint ~]# chmod 755 multiplication.sh
[Root@tecmint ~]#./multiplication.sh
"Enter the": "
11
"Enter The Second Number:"
11
11 * 11 = 12
Division operations
Copy Code code as follows:
#!/bin/bash
echo "Enter the" number: "
Read a
echo "Enter The Second Number:"
Read B
echo "$a/$b = $ (expr $a/$b)"
Output results:
Copy Code code as follows:
[Root@tecmint ~]# VI division.sh
[Root@tecmint ~]# chmod 755 division.sh
[Root@tecmint ~]#./division.sh
"Enter the": "
12
"Enter The Second Number:"
3
12/3 = 4
Array
The following script can print a set of numbers.
Copy Code code as follows:
#!/bin/bash
echo "Enter the number upto which you want to Print Table:"
Read n
I=1
While [$i-ne 10]
Todo
i=$ (expr $i + 1)
table=$ (expr $i \* $n)
Echo $table
Done
Output results:
Copy Code code as follows:
[Root@tecmint ~]# VI table.sh
[Root@tecmint ~]# chmod 755 table.sh
[Root@tecmint ~]#./table.sh
"Enter the number upto which you want to Print Table:"
29
58
87
116
145
174
203
232
261
290
You can download the code for this example from here
Judging odd and even
Copy Code code as follows:
#!/bin/bash
echo "Enter the number"
Read n
num=$ (expr $n% 2)
If [$num-eq 0]
Then
echo "is a even number"
Else
echo "is a ODD number"
Fi
Output results:
Copy Code code 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
Number of factorial
Copy Code code as follows:
#!/bin/bash
echo "Enter the number"
Read a
Fact=1
While [$a-ne 0]
Todo
fact=$ (expr $fact \* $a)
a=$ (expr $a-1)
Done
Echo $fact
Output results:
Copy Code code 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 from here
Judge the number of Armstrong
Armstrong: In three-bit positive integers, such as ABC, there are some that may satisfy (a^3) + (b^3) + (c^3) =abc, that is, the cubic of the individual digits and exactly the number itself. These numbers are called Armstrong numbers.
Copy Code code as follows:
#!/bin/bash
echo "Enter A number"
Read n
Arm=0
temp= $n
While [$n-ne 0]
Todo
r=$ (expr $n% 10)
arm=$ (expr $arm + $r \* $r \* $r)
n=$ (expr $n/10)
Done
Echo $arm
If [$arm-eq $temp]
Then
echo "Armstrong"
Else
echo "Not Armstrong"
Fi
Output results:
Copy Code code as follows:
[Root@tecmint ~]# VI armstrong.sh
[Root@tecmint ~]# chmod 755 armstrong.sh
[Root@tecmint ~]#./armstrong.sh
Enter A Number
371
371
Armstrong
1
2
3
4
5
6
[Root@tecmint ~]#./armstrong.sh
Enter A Number
123
36
Not Armstrong
Judging prime numbers
Copy Code code as follows:
#!/bin/bash
echo "Enter any number"
Read n
I=1
C=1
While [$i-le $n]
Todo
i=$ (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 results:
Copy Code code as follows:
[Root@tecmint ~]# VI prime.sh
[Root@tecmint ~]# chmod 755 prime.sh
[Root@tecmint ~]#./prime.sh
"Enter any number"
12
"Not Prime"
