100 Shell Programs in Unix

echo The distance in feets is $feet feets

Sample Run

$sh prg64

Input distance in kilometers

2

The distance in meters is 2000 meters

The distance in centimeters is 200000 cm

The distance in inches is 787401 inches

The distance in feets is 65616 feets

65. To display date and time in different formats by using positional parameters.

$vi prg65

clear

#Date in desired format

set ‘date’    #Setting positional parameters through date command

echo $3 $2 $6

echo $4

echo $2 $3 $6

echo $2 $6 $3

Sample Run

$sh prg65

30 Apr 2008

16:51:58

Apr 30 2008

Apr 2008 30

66. Moving shell files from PWD to specified directory.

$vi prg66

if [ $# -lt 1 ]

then

echo Improper Usage : $0 Pathname

fi

mv *.sh $1

echo All files are moved in the $1 directory

ls $1

Sample Run

$sh prg66 abc

All files are moved in the abc directory

a.sh

b.sh

$sh prg66

Improper Usage : p1 Pathname

67. To print all the files and total number of files in given directory.

$vi prg67

clear

if [ $# -lt 1 ]

then

echo Improper Usage : $0 pathname

fi

oldifs=$ifs

ifs=/

for arg in $*

do

if [ -d $arg ]

then

cd $arg

echo Present directory

echo $arg

echo Files in the directory :

ls

echo total number of files in this directory :

echo ‘ls | wc -w’

else

if [ -f $arg ]

then

echo $arg is a file

exit

fi

fi

done

ifs=$oldifs

Sample Run

$sh prg67

Improper Usage : p1 pathname

$sh prg67 /root

96

Present directory

/root

Files in the directory :

a  aaa.c  abc2  b  c  ddd  ddd1

total files in this directory :

9

$sh prg67 abc

abc is a file

exit

Desktop  p1

68. To sort strings.

$vi prg68

clear

echo Type string 1.

cat >> srt1

echo Type string 2.

cat>> str2

echo Type string 3.

cat>> str3

echo sorted strings are

sort str1 str2 str 3

Sample Run

$sh prg68

Type string 1.

abc

Type string 2.

xyz

Type string 3.

mnop

sorted strings are

abc

mnop

xyz

69. To find binary equivalent of a decimal number.

$vi prg69

clear

echo Enter a number

read a

pow=1

sol=0

while [ $a -gt 0 ]

do

x=‘expr $a % 2’

inter=‘expr $x \* $pow’

sol=‘expr $sol + $inter’

pow=‘expr $pow \* 10’

a=‘expr $a / 2’

done

echo $sol

Sample Run

$sh prg69

enter a number

12

1100

$sh prg69

Enter a number

102

1100110

$sh prg69

Enter a number

2984

101110101000

99

70. To calculate simple interest.

$vi prg70

#Calculate a simple interest

clear

echo Enter values of Principle, Time (in yrs), and rate

read p n r

si=‘expr $p \* $n \* $r / 100’

echo Simple Interest=Rs.

$si

Sample Run

$sh prg70

Enter values of Principle, Time (in yrs), and rate

2500 3 25

Simple Interest=Rs. 1875

71. If the sides of a triangle are denoted by a, b and c then area of the triangle is given by

area = Square root of (s(s-a)(s-b)(s-c))

where, s = (a+b+c)/2

$vi prg71

clear

echo Enter sides of a triangle

read a b c

s=‘expr \( $a + $b + $c \) / 2’

area=‘expr \( $s \* \( $s - $a \) \* \( $s - $b \) \* \( $s - $c \) \)’

area=‘echo sqrt \( $area \) | bc’

echo Area of the triangle is $area

Sample Run

$sh prg71

Enter sides of a triangle

60 70 50

Area of the triangle is 1469

101

72. Program to display system date in format MM/DD/YY & system time in format hrs:mins:secs.

$vi prg72

clear

echo The current system date in required format is :

date +%D

echo The current system time in required format is :

date +%T

Sample Run

$sh prg72

The current system date in required format is :

04/05/08 //  Means 5

^th

April 2008

The current system time in required format is :

10:26:47 //  Means 10 hrs 26 mins 47 secs

73. Program to say hello to the user.

$vi prg73

clear

echo Enter your Name

read name

echo Hello $name

Sample Run

$sh prg73

Enter your Name Charles Babbage Hello Charles Babbage Enter your Name Dennis Ritchie Hello Dennis Ritchie

74. Program to display a message using switch case.

$vi prg74

clear

echo Enter a number between 1 and 3

read num

case $num in

1) echo You have Entered 1 ;;

2) echo You have Entered 2 ;;

3) echo You have Entered 3 ;;

*) echo Please enter some value between 1 & 3 ;;

esac

Sample Run

$sh prg74

Enter a number between 1 and 3

3

You have Entered 3

$sh prg74

Enter a number between 1 and 3

2

You have Entered 2

75. Write a menu driven program which has following option-(

a

)    Factorial of a number

(b)

Prime or not

(c)

Odd or even

(d)

Exit

$vi prg75

clear

ch=y