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Shell Script Examples for Beginners

The document contains several Bash shell programs that demonstrate basic programming concepts like conditionals, loops, functions, input/output. The programs include calculating salary, finding the largest of two numbers, checking leap years, calculating area and perimeter of a rectangle, arithmetic operations using a case statement, printing prime numbers between 1 and 100, printing N natural numbers, calculating the sum of digits in a 5 digit number, calculating factorials, and generating combinations using nested for loops.

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Gokul G-Factor Kumar
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224 views20 pages

Shell Script Examples for Beginners

The document contains several Bash shell programs that demonstrate basic programming concepts like conditionals, loops, functions, input/output. The programs include calculating salary, finding the largest of two numbers, checking leap years, calculating area and perimeter of a rectangle, arithmetic operations using a case statement, printing prime numbers between 1 and 100, printing N natural numbers, calculating the sum of digits in a 5 digit number, calculating factorials, and generating combinations using nested for loops.

Uploaded by

Gokul G-Factor Kumar
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Program:

/* Basic Salary*/

echo "Basic salary"


read basic
da=` expr $basic \* 10 / 100 `
hra=` expr $basic \* 20 / 100 `
gross=` expr $basic + $da + $hra `
echo "Gross Salary = $gross"
Output:

Basic salary
1000
gross Salary = 1300
Program:

\* To find the biggest of two numbers *\

echo "Enter two nos"


read n m
if [ " $n " -gt " $m " ]
then
echo $n in Big
else
echo $m is big
fi
Output:

Enter two nos


10 20
20 is big
Program:

\* Leap Year *\

echo Enter the year


read y
if [` expr $y % 4 ` -eq "0" ]
then
echo It is leap year
else
echo It is not leap year
fi
Output:

Enter the year


2004
It is leap year

Enter the year


2009
It is not leap year
Program:

\* Area and Perimeter of a Rectangle *\

echo enter length breadth


read length breadth
areaR=` expr $length \* $breadth `
periR=` expr $length \* 2 + $breadth \* 2 `
echo Area of Rectangle= $areaR Perimeter= $periR
Output:

enter length breadth


15 5
Area of Rectangle= 75 Perimeter= 40
Program:

\* Arithmetic Operations Using Case *\

echo "Enter two numbers"


read a b
echo "1.Add 2.Sub 3.Mul 4.Div 5.Exit"
read op
case $op in
1) c= expr $a + $b ;;
2) c= expr $a - $b ;;
3) c= expr $a \* $b ;;
4) c= expr $a / $b ;;
5) exit
esac
echo $c
Output:

Enter two numbers: 2 2


1.Add 2.Sub 3.Mul 4.Div 5.Exit
1
4

Enter two numbers: 4 2


1.Add 2.Sub 3.Mul 4.Div 5.Exit
2
2

Enter two numbers: 4 2


1.Add 2.Sub 3.Mul 4.Div 5.Exit
3
8

Enter two numbers: 4 2


1.Add 2.Sub 3.Mul 4.Div 5.Exit
4
2

Enter two numbers: 4 2


1.Add 2.Sub 3.Mul 4.Div 5.Exit
5
Program:

\* Print Prime nos between 1 and 100 *\

n=1
echo $n
while [ "$n" -le "100" ]
do
i=2
while [ "$i" -le ` expr $n - 1 ` ]
do
if [ ` expr $n % $i ` -eq 0 ]
then
break
else
i=` expr $i + 1 `
fi
done
if [ $n -eq $i ]
then
echo $n
fi
n=` expr $n + 1 `
done
Output:

1
2
3
5
7
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97
Program:

\* To print N Natural numbers *\

i=1
read n
while [ "$i" -le "$n" ]
do
echo $i
i=` expr $i + 1 `
done
Output:

5
1
2
3
4
5
Program:

\* Sum of digits of five digit numbers *\

echo Enter any five digit number


read num
d1=` expr $num % 10 `
num=` expr $num / 10 `
d2=` expr $num % 10 `
num=` expr $num / 10 `
d3=` expr $num % 10 `
num=` expr $num / 10 `
d4=` expr $num % 10 `
num=` expr $num / 10 `
d5=` expr $num % 10 `
num=` expr $num / 10 `
sum=` expr $d1 + $d2 + $d3 + $d4 + $d5 `
echo sum of digits = $sum
Output:

Enter any five digit number


12345
sum of digits = 15
Program:

\* Factorial of a given number *\

echo "Enter Number"


read n
i=1
f=1
while [ $i -le $n ]
do
f=` expr $f \* $i `
i=` expr $i + 1 `
done
echo "factorial is.....$f"
Output:

Enter Number
5
factorial is.....120
Program:

\* Combinations of 1, 2 & 3 using for loop *\

clear
for i in 1 2 3
do
for j in 1 2 3
do
for k in 1 2 3
do
echo $i $j $k
done
done
done
Output:

clear
for i in 1 2 3
111 321
112 322
113 323
121 331
122 332
123 333
131
132
133
211
212
213
221
222
223
231
232
233
311
312
313

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