## Latest Posts

1. Read user input and display message Welcome

```#!/bin/bash
```
Sample output:
Devinline
Welcome on Devinline

2. Print Even natural numbers up to given N.
```#!/bin/bash
echo 'Enter input value N=?' ;
x=0 #no space in variable declaration
zero=0
t=9
while [ \$x -le \$N ]
do
let p=\$x%2;
if [ \$p -eq 0 ]
then
echo "\$x"
fi
x=\$((x+1))
done
```
Sample Output:-
[cloudera@quickstart Desktop]\$ sh even.sh
Enter input value N=?
15
0
2
4
6
8
10
12
14

3. Print 1 to N  (N is read as user input)
```#!/bin/bash
x=1
echo 'Enter input value N=?' ;
while [ \$x -le \$N ]
do
echo \$x
x=\$((x+1)) #Arithmatic compound expression
done
```
Sample output:-
Enter input value N=?
8
1
2
3
4
5
6
7
8

4. Arithmetic operation - read two number from user and perform addition, subtraction, multiplication and division

```#!/bin/bash
echo 'Enter input value1 x=?' ;
echo 'Enter input value2 y=?' ;
echo "Sum is \$((x+y))"
echo "Subtraction is \$((x-y))"
echo "Multiplication is \$((x*y))"
echo "Division is \$((x/y))"
```
Sample Output:-
Enter input value1 x=?
12
Enter input value2 y=?
4
Sum is 16
Subtraction is 8
Multiplication is 48
Division is 3

5. Compare two number entered as user input (If-else block)

```#!/bin/bash
echo 'Enter input value1 x=?' ;
echo 'Enter input value2 y=?' ;
if [ \$x -gt \$y ]
then
echo "X is greater than Y"
elif [ \$x -lt \$y ]
then
echo "X is less than Y"
else
echo "X is equal to Y"
fi
```
Sample output:-
Enter input value1 x=?
12
Enter input value2 y=?
34
X is less than Y

6. Using Switch case - Print YES if Y/y is user input and NO for N/n 6666666666666666

```#!/bin/bash
echo 'Enter input char=?' ;

case "\$char" in
Y) echo "YES"
;;
y) echo "YES"
;;
n) echo "NO"
;;
N)   echo "NO" ;;
esac
```
Sample output:-
Enter input char=?
y
YES

7. Check triangle is SCALENE,ISOSCELES or EQUILATERAL . Get sides of triangle as user input.

```#!/bin/bash
echo 'Enter triangle side1 length x=?' ;
echo 'Enter triangle side1 length y=?' ;
echo 'Enter triangle side1 length z=?' ;
if [ \$x -eq \$y ] && [ \$y -eq \$z ]
then
echo "EQUILATERAL triangle"
elif [ \$x -eq \$y ] ||  [ \$y -eq \$z  ] || [ \$x -eq \$z ]
then
echo "ISOSCELES triangle"
else
echo "SCALENE triangle"
fi
```
Sample output:-
Enter triangle side1 length x=?
6
Enter triangle side1 length y=?
5
Enter triangle side1 length z=?
5
ISOSCELES triangle

8. Sum of N natural numbers. Take user input value of N.

```#!/bin/bash

echo -n "Enter number N=?"

s=0 # here sum

for((i=1; i <=N ; i++))
do
let s=\$s+\$i
done

echo "sum= "\$s
```
Sample output:-
[cloudera@quickstart Desktop]\$ sh sum.sh
Enter number N=?5
sum= 15